Like the version you currently have? You can go to the Apple icon in the menu bar, in that drop down select About This Mac and it will tell you which version you have (10.6.x is Snow Leopard, 10.5.x is Leopard, 10.4.x is Tiger...)
In terms of using your MBP, probably the best bet is to find the OS you have (if it's brand new just bought from the store, you most likely have Snow leopard unless you bought new old stock) then look up a book called:
Mac OSX <OS VERSION>: The Missing Manual
so if you have Snow Leopard, it'd be called: Mac OSX Snow Leopard: The Missing Manual - it's a paper back book that really gives you a lot of the ins and outs of OSX.