Hey broski, i will follow this, since i'm in this too i will share some of my experience below!
1.Prepare to fail and burn a lot of money on ads, but never give up
2.When you find a winner (product), scale the hell out of it!
3.I will suggest you to focus on certain niche shop, don't go global shop
4.Better set higher prices but free shipping
5.Free + Shipping method is dead af..
6.Test 10 products, each of them let it have 5 different ad sets, each 5$ a day.. After 4-5 days you will find 1-2 winners (ad sets too) and then scaale!