That all depends on what's been done to it. But if you bought it used, with no maintenance documentation or reciepts, it's probably best to assume nothings been done. In other words, just go ahead and do everything .

Oil and filter change, air filter, coolant flush, brake fluid, tranny fluid, spark plugs, that kind of stuff.

Or go here:
http://www.ahm-ownerlink.com/
Create a username and password and it will have all the maintenance stuff for you as well as all the info on your car base on your vin.