If you are going to just sell at flea markets then dont worry about it. If you start a website and all that then you will need to get a tax ID number with the IRS and the you will need your state and local tax numbers. Then be prepaired to file quarterly taxes. 10% tax through the fed gov on all fishing stuff. Then depending on your state, you will have to set the sells tax for that state, then hand it over every quarter. You can make more money at flea markets or fishing expos, then you will from on line.