Model Railroading, like any other hobby, is an hole which can absorb an endless amount of money. There are a seemingless endless list of questions that need to be asked before getting in very deep, but you have to begin somewhere. My best advice is to look for a hobby store that has staff who are model railroaders. They will help you sort throught the most pressing issues. For example, digital command control (DCC) is now widely available. This allows the operator to control each locomotive and accessory individually. But like everything else, it gets expensive - a simple DCC costs about $500 for the control unit and $100 per engine or accessory controlled. I still run my pike using a dual transofrmer wired in common track mode - but my guess is that I will convert to DCC is the not too distant future - ouch!!!
There are a lot of good plastic engines and rolling stock available but they are not of the quality of brass equipment. The cost of engines can run from as little as $10 to $5000 per unit! A good quality plastic engine can cost $500.
Over the years my layout has gone from very basic on a single sheet of plywood with a single engine and a few cars to a much more complex configuration (approx. 10' x 20') with over 40 engines and about 100 cars, about 50 indivually power track segments and about 50 switches. My initial engines and rolling stock were plastic - now I only buy brass models of specific road names and configurations. I spend hours and hours working on my system and enjoy it tremendously - but is is expensive. eBay is a tremendous source for equipment but you have to know what to look for - it is very easy to get burned. I recently bought a brass engine that was described as mint. The pictures looked great. The answers to all of the questions were appropriate. But when I received it I found that someone had crudely cobbled out sections of the frame to try to allow the leading and trailing trucks to turn sharper to negotiate tighter radius corners. The seller claims he didn't know about these modifications. Needless to say that the item is worth a fraction of what I paid for it. It still looks good and runs well but it isn't mint.
But it is still a great hobby - and it doesn't have to be expensive, but it can easily become so. Good luck! /forums/images/graemlins/smile.gif /forums/images/graemlins/smile.gif