Welcome to Xoutpost! This site has saved me thousands!!! Literally. Try not to floor it until your engine is warmed up, will save you a lot of grief in the near future.
When I got my first X a year ago I changed the oil (i do that with all the cars I buy) right away, spark plugs about 2k later (65k), all the filters, and tyres. The ones on them were a little too dry for my taste. So far I have changed brakes, rotors, brake fluid, power steering fluid, and antifreeze. Other small stuff here and there have gone wrong, but no major problems thanks to this forum!!!

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New