code:

Valks cry x 22  - Save, these are for increasing a failstack
Blessing of Kamasylve 7 days x 2 (don't stack)  - Save, if you decide you like gathering these are very useful for more energy regen
Mercenary's Skill 60 x 1  - Use it for skill exp when you're grinding
Item Collection Increase Scroll x 28 - These are called "loot scrolls" by the community and significantly boost the amount of loot you get. If you are casual you will probably get more of these than you can ever use, so use one whenever you're grinding
Premium Elixir Box x 3 - Can open the box and consume these whenever they'd be applicable
Oasis Dream Chest x 2 - Open these, they give these out every day. Usually will have something you can use or sell on the market right away. 
Event high quality draught box x 5 - See premium elixir box. 
Rainbow gem fruit x 3 - Sell on market, these are for making tier9 horses which you won't have to worry about for a long rear end time if ever. 
Spirit pouch of ferocious beast x 3 - Same as rainbow gem fruit. 
J's hammer of loyalty - Save this, it gives you a free shot at an enhancement attempt. Do note it has an expiry date but I would stall and use it later once you're more familiar with how enhancing works. 
Tuvala ore x 54  - Save these, these are for acquiring tuvala gear which is for seasonal characters.
Refined magical black stone x 20 - Use these to guarantee a tri tuvala enhancement. 
time-filled black stone x 700 - These are for enhancing tuvala gear, save these to enhance your season characters gear, and as a new player you definitely want to be playing seasons. 
Burning moonlight black stone x 28 - Save these, these are for the pen accessory daily questline and are using for enhancing that accessory. I would recommend picking crescent guardian ring. 
Cron stone x 676 - Save these, they protect an item from downgrading on a failed enhancement attempt. 
Event daybreak stone x 4   - I don't remember what these are lol
Event secret scroll of devotion 20 x 2 - Don't remember these either
Laila's petal x 6 - You can turn these in at the node "kamasylve temple" east of heidel for fairy wings. Fairy wings unbox into a random tier fairy. You want a tier4 fairy (I think the prefix is "radiant" but I could be mis remembering). 
Black gem fragment x 1 - Sell on market
Ancient spirit dust x 38 - Hit L, select simple alchemy, and select ancient spirit dust and a blackstone armor or blackstone weapon to turn 5 dust into 1 caphras stone. Then sell the caphras stone on market. 
Fairy powder x 15 - I think this is just the 10k silver vendor trash item. 
Event artisan's memory x 20  - Save these, when you fail an enhance the gear loses max durability. You can use either memory fragments or a duplicate copy of the gear to repair the max durability, and artisan's multiply that repair value by 5. 
Event advice of immortality x 4 - Right click these, they will either turn into another advice of  _____ thingie to click on, or will turn into a random reward item that you can probably sell on the market or use immediately.
Event shining shakatu's seal x 5 - Save these, you get 10 a month + sometimes random giveaways on top of that and the exchangable items are worth quite a bit. 
Event tachros's spirit stone x 1 - An unrepairable alchemy stone that isn't particularly special. You can just use it when appropriate by equipping it and hitting U, or checking the "auto use" box below it. When it runs out of fuel you can toss it. 
Event magical elixir x 2 - Turns a 15 minute draught into a 1 hour draught. As a new player this is whatever, you could vendor it if is has silver value or toss it, not a big deal. 
Enchanted scroll +20 x 1 - Save these, these can be crafted into "advice of valks +20" which is a consumable item to give you what the community calls a "Failstack" that boosts your enhancing chance. 
Event secret book of old moon 7 days x 1 - Gives exp buffs and some other perks. Save this for a 7 day period where you feel like you'll have the most time to be playing to take advantage of the exp boosts. 
Event shakatu's shiny box Life x 1 - Open it and most likely sell whatever it spits out on the market. 
Yona's fragment x 5 - save these, you'll need em for the pen accessory quest later. 
Advice of valks +50 x 1 - save this
Destruction spirit stone x 1 - Equip it and use it when grinding by pressing U or using the "auto use" checkbox on the character equipment sheet. When it runs out of durability you can unequip it, hit L, select "Grind", and grind it into mystical spirit powder which can repair other alchemy stones that are actually repairable. Spirit stones are not repairable but normal alchemy stones are. 
Event black magic crystal box x 1- open it, probably sell the contents. 
Black spirit essence x 2 - Normally you can't remove crystals from your gear without one of these, a cash shop item. Save these. 
Event enhancement help kit II x 1 - Open it and save or sell the contents. 
Theia's orb x 3 - Save these although you probably wont use them for a long time. Used for rerolling fairy skills which do help a lot but this is normally a cash shop item. 
Caphras stone bundle - 5 x 2 - Open and sell, caphras stones are an end game thing you don't need to worry about for a while. 
Sharp black crystal shard - 3 x 1 - Sell, this is an enhancement mat for non-season weapons. 
Caphras stone x 6 - Sell
Caphras stone bundle x 1 - Open and sell
Event advice of safety x 3 - Right click, it will either turn into another advice of ____, or give you a random reward. Probably sell the reward. 
Black spirit's adventurer box x 4 - Open, sell the contents. 
Arcana of fate box x 1 - Open, right click on all the thingies it gives which are for the black spirit board game. 
Sacred statue of ashula x 1 - I think this is just vendor trash? 
Concentrated magical black stone - weapon x 1 - Sell, this is a non-season weapon enhancement mat
Whale tendon potion x 1- Sell
Variety of dim magical crystals - Newbie starter crystals. Use em or toss em don't think it matters
Variety of weapon exchange coupons - Save these, they give them out very rarely and can change weapon types from one class to another. Useful for rerolling at end game when you have real expensive weapons.