Couple first considerations:
1) Avoid building RR on a flat (usually 4'x8' ply sheet) surface...It makes many aspects of building the RR very very difficult. Learn 'open grid' or 'L girder' benchwork and go with that.This benchwork is a bit more involved but pays off in the end..One how-to book is "Model Railroad Benchwork" by Lynn Wescott.
2) If you haven't a $ restriction, best go right into DCC..Has way way less wiring demands than older analog DC..and you then have complete independence of trains/locos + sound, lighting, bell/horn/whistle control,etc..NCE PowerCab is about $150...Or go with Digitrax, Bachmann, control.
3) Instead of buying a 'starter set', better to buy one very good 'DCC/sound on board' engine and separate cars. Make sure they have operating knuckle-couplers.
Dat's it for now..Go slow and steady. Don't over purchase.:smokin: M