to the werkz!
what i suggest you do:
develop a car history of your own.
1) replace all fluids, and filters ( that gives u an insight to the engines condition)
2) inspect belts and other rubber parts for wear, and replace if necessary
3) check brake pads
4) check for telltale signs of leaks.
5) check tire treads for uneven wear...
other than that... u need not even worry about changing plugs & 02 sensors until you reach the 100,000 mile mark.