FBA Product Suggestions?

I have a product that I produce myself, but it competes with other products in the same category. It’s been a big seller for me (3,800 units in the last 12 months). My production cost is about $1.25 each, and they sell for $7.00 each with $6.00 flat rate shipping using FBM. The item is about 4 ounces each

For those that have used FBA, is this a good product to use this for? Reasonably how much increase could I expect for doing FBA?

Second part of my question: since I produce these myself, there’s no barcode or anything on the item. how does this work with FBA? Would I have to create one? Would it have to be printed on the item itself, or would a sticker on the packaging suffice?

Thanks so much!