What is your market? What are you offerring? You say 'becoming a reseller' so are you thinking of starting up a web hosting company? I'm a little lost, but here's some broad things to keep in mind...
Be specific in your goals and make sure you really can offer what the others do not. This really requires a lot of research and development. Once you have your idea well developed you can start brainstorming on a domain and hosting.
Typically you don't need to purchase servers to begin with unless you're dumping copius amounts of money into marketing and will need the extra processing power and bandwidth.
I could go on but since you offered really no solid idea as to what you are trying to create I can't give any specifics.