Yaztromo had a good suggestion, maybe a solo type game might work to help you learn the ropes but if you wanted here is the link for games looking for players
link to another game in there you can review and the games currently looking for players, the type of game it is, some have intros you can read and see what it is all about.
Just read through them and see if any might peak your interest. Also, make sure you can join them too, there are rules on joining certain types Adult, Mature... be sure you understand these rules as this will determine what games you can join as well.
Hope you find something to join or a GM here to guide you through.