Here are a few more enlightening articles...

http://www.rcnitro.com/rn/articles/system_basics.asp
http://www.rcnitro.com/rn/articles/engine_timing.asp
http://www.rcnitro.com/rn/articles/carburetor.asp
http://www.rcnitro.com/rn/articles/nitroengines1.asp

I agree with Mad Wax, electric cars are much more beginner friendly. Nitro cars are much more complex, with more moving parts (in general) and more things which will require regular maintenance.