I'm trying out for tennis tomorrow but I don't really know how to play? I've only practiced a bit, should I still tryout?
Why not? It’s good to try something at least once.
Do you LIKE the game? If you do, then try out. If you don't make the team, then take lessons from a good teaching pro, and join a club. You will probably get better instruction from the club, anyway. Some teams have what are called "No-Cut" programs, where everybody gets to come out and hit, somewhere. Best of luck, hope you have lots of fun :-)
Give it a shot.
If you want to learn more go for it !
Yeah practice makes Federer.