Congrats! Sounds like the beginning of some fun for you!
Best way to find more information is to first identify the locomotive by the number on the side of the cab. You can then look it up by following this link: http://www.tandem-associates.c...ionellocomotives.htm
There are numerous forum members that will know much more than what is shown on that website, but it's a basic start.
Do you have a transformer and track? You have to be careful with the old cord wiring as it can become brittle and cause a fire hazard.
Please post some pictures and I'm sure you will get some more info from the sharp people around here and either have it running soon or know what to do to get it running again in short order. Generally, if it's in decent shape, it will need some cleaning and lubrication before you really get rolling.
JD