Creating a basketball game with some troubles , need help !

Hi , guys , i wanna create a basketball shooting game in alice. But i got no idea at the begining , could someone tell me how can i start or what code i should drag in alice. Moreover , i need some useful models , can anyone give me some recommendation? thx for your help ~

just like NBA 3-point shoot out ....i got no idea...

And here is my world , hope someone will teach me how to create this

http://www.sendspace.com/file/ju3pj4

benzr, world looks cool, I wish my school was doing this. I will try and help but I am pretty new as well.