Burr, I appreciate your desire to jump into the domain registration and webhosting business but there are better ways to do it. You appear to be responding to an offer in the Job Offers forums where you will get a 20% commission by selling for a reseller of Directi. You can become a reseller yourself (cheap or no cost) and cut out this middleman. You can signup with one of the registrars below - all of whom use the same interface. Note - it's not easy to make money in this market as most domain buyers prefer to go with an established registrar not a reseller.
Are you domain name reseller?
In this case I recommend you looking for your competitors to see what they offer if you will be offering high price and the beginning that will be really slow for you to get a lot of clients.