From what I have been learning, firstly make sure you have all your ID's and paperwork in place before anything else as later you will struggle at the last minute.
Before I launched Edge Content, I spoke to alot of content store owners and got some good advice and 99.999% of the innitial stuff was make sure you understand the 2257 stuff and you have all the papers for it. If there is a problem with the content, you will be the first one they come to.
Secondly make sure you have a good script and that you have a rough plan what you want to offer and it assists you without giving you a headache to add new content etc.
Thirdly check out processors and any other billing you want to provide and that you can work with them.
The last bit of advice I would say is don't launch until you are 100% ready to, I was anxious and got my head in a spin. It took a while to calm everything down and get the site at a point where I actually could launch it without giving myself a ton of hassle!
Either way whatever you do, GOOD LUCK!
