OK i sell digital services online. I actually have a business license, tax id number and taking business classes right now. basically if you will be making money than you will need to report it to government depending on how much you make.
you honestly don't have to add sales tax and such. sell for the price you want, the problem is that if you made good money the government will retro charge you for your sales.
like i worked a job and the government charged me taxes, out of each pay check. so when you sell your files you still owe the government a small part of that. they only go after it if you made decent money.
wind