Before you start playing, you have to register and create your avatar; you can choose the gender, skin color, clothing, appearance, etc. Once you're inside the game, you can customize it even more.
If you've played other similar games before, like Second Life, the gameplay will immediately seem familiar. You can move around freely throughout a 3D environment, talking and interacting with everyone else that's there.
vSide is a great social game. You can use it just to have some fun, or even to meet new people online.