Hi Woodstock, Glad to have you join us! Like Bob, Willie, LASM/David and Chet have said, as well as numerous other members, there is plenty of experience to go around on the forums here and all mentioned including myself David/Trussrod, are all very knowledgeable model railroaders with many years of experience and more than willing to help when we can.
This is a very friendly place so don't be shy and jump right into anything that suits you.
Being that this your first RR in 25 yrs., give us an idea of the Scale your considering modeling, the Road name/s and the time period your most interested in. The scale and space you have available will determine to a large extent what you do?
Again, welcome to the forum!