I'm confused with what counts as supplies expenses. I work on Etsy and booth at conventions. Do the items I paid in bulk, decor, storage, bubble mailers, etc all count?

If the keychains are part of your inventory for sale, they should be reported either in the inventory section as Cost of Goods Sold or in the expenses section as supplies. See this article for more information regarding how to track and report inventory.

 

The shipping supplies such as bubble mailers should also be reported as expenses.

 

Assuming you mean items such as boxes and storage bins, storage containers can be deducted if they are only used for business. If, for example, you purchased a large storage shed, it should be reported as an asset instead of an expense.

 

See this article for more information on reporting small businesses in TurboTax.