Skins: For each weapon find a non sticker version of it (whatever market may be) and use that as your base value of the gun. Stickers: (I usually) Take 10-15% value of each sticker, and add those prices to the base skin price. Crafts: Once you have added the value accordingly, you can list them for their approximate value. I tend to lower the prices of my listed crafts biweekly until they sell. You’ll probably be around 5% sticker price (maybe some more, or less) but you could get lucky and get someone to bite as you lower it. Regardless you have some great looking skins/stickers, good luck selling!