Are you talking about live chess (X# minutes for your combined turns) or online (turn-based, X# days per move)? Either way, I think that one or two RATED games should get you a rating. Make sure if that's what you're looking for to only accept and create rated games.
Resolved: Hello World (and a quick question)


You can usually find your own chess.com answers by using the search window here and going to the HELP files. Also check out my 3rd link, search engines outside of chess.com will often provide you with answers quickly once you know how to use them.
http://support.chess.com/Knowledgebase/Article/View/16/13/how-do-ratings-work
http://www.chess.com/article/view/chess-ratings---how-they-work
http://www.cln.org/searching_faqs.html
Hi All, Just recently joined so wanted to say hi. o/ I'm a keen amateur player and it's really great to find a place with so many other chess fans. :-) As for the question, I'm using the iPhone app to play at the moment - do you know if I have to play a certain number of games before I get a rating? Thanks in advance. Looking forward to meeting many of you over a game or two. Cheers, N.