Well, welcom to the forums,
For a FPS game i would recomend FPScreator, its easy to use, theres basicly an unlimited amount of free media here on the forums, there are so many tortorials and so much help here, its really a cake walk when going to make a game. The only downside to FPSc is that its a bit buggy at some times. But if your computer meets the requierments then you souldn't have any problems.
http://www.fpscreator.com/
http://forum.thegamecreators.com/?m=forum_view&t=131868&b=21
then there is even an dx10 version but you will need Windows Vista and a DX10 video card.
http://www.fpscreatorx10.com/
compatibel video card list:
http://forum.thegamecreators.com/?m=forum_view&t=138684&b=33
that should give you a good start on things, but im not sure what to use for a sports game, maybe Darkbasic pro?
but anyway hope this info helps and points you to a good game makeing experiance. Remember have fun!!
Pain
Me = noob
and i love The TGC : )