Welcome to the guild! I hope you have fun here!
Now, since you're new, you'll want to read the guild rules first before you get down to any RPing. From there, you can decide whether you'd like to start a RP as a GM, or join one. Whatever one you choose, there are multiple places for skill level and type of roleplaying.
Free is where you get short, quick burst replies. Tends to be one liners or so.
Casual is the middle ground. Tends to be a few paragraphs of content.
Advanced is the more drawn out roleplays. Tends to be multiple paragraphs with detailed information.
Arena is where people go to write their characters locked in duels.
Nation is roleplaying a nation and how it functions.
Tabletop is what it sounds like, being your classic tabletop games like D&D.
Edit: Forgot the 1x1 section! It's where people go to write a roleplay with one other person.