If you've bought a domain from someone here at NamePros, it's a good idea to pm the seller if you haven't heard from them yet. You can check at the bottom of the main page to see if they're online. If they're not, be patient :hehe:
You usually need to pay for the domain before you receive it. If you are paying in NP$, you can send them directly to the seller. If you are paying via paypal, you will need to pm the seller for their paypal ID.
They will probably want you to set up an account at the registrar (Godaddy, Enom, etc..) where the domain was located so that they can "push" the domain to your account for free. You will then need to pm the seller with your account info (ID, e-mail, etc...)
Once you receive the domain, it's really up to you what you do with it. You can just keep it in your account if you like. You could "park" it at a place like sedo.com to maybe make a few cents every time someone clicks on one of the links on your site. You could develop it by finding a host, and putting content on your page. You could even resell it.
Good luck! :wave: