Hi JPC, welcome!
Part of the fun of the hobby for me is internet research - there's a WEALTH of information, as well as a wealth here. There's a youtube video by Eric Siegel that explains the ins and outs of Lionel and MTH compatibility:http://www.youtube.com/watch?v=caIPXwkqNb4&feature=plcp
Take your time and let your style and interest develop. What works for someone else may not work for you. I've known guys that "just got into the hobby" only to spend tons of money and get burned out really quickly.
Carlton