Hi Bigurl4u
To create an avatar, just go customize (top left of the window).
There you can change gender, hair, skin color, clothes, eyes and so on.
Then when happy with changes you can put a name to your outfit, and save it. You can have 10 free outfits and a total of 20.
To come back to the world you just have to click "show changes".
Have fun and hugs,
Iris