Hey there! Welcome to RPN! Sorry for the delayed greeting. >____<
If you haven't already, take a look at the Welcome to RPNation greeting page by one of our admins. It has a lot of links to help you get started and gives you an overview of just about everything you need to know. You can also check out our Questions and Information forum for a list of the rules, staff list, BBcode guide, and the like. There's a lot of great information there and if you ever need to reach users or staff with a particular query, it is definitely the place to go!
BUT since you came here for RP, here's the really important links!
If you fancy 1x1 Roleplays (private role-plays) there is a recruitment forum right here where you can find your perfect match(es). If you don't see a thread worth responding to, feel free to create your own!
For group roleplays (3+ players) we have several places to look! The recruitment forum is here but you can also just peruse the role-plays themselves for the perfect choice. Here you can find the thread RPs (for a singular storyline) sorted by genre. Forum role-plays are used for bigger stories with several plot lines, larger groups, and the dice role-plays.
If you just want to chat about things, feel free to visit the Discussion Forums. Once you've made 10 posts, you'll also be able to visit our chatroom (we call it a Shoutbox), use the website's Teamspeak, send private messages, alter your signature, and other neat stuff.
And please feel free to let me know if you need anything. =)