jay_w_uk, I mentioned this to you before but there is a really good manual included with Trainz. Every question you have asked to date is clearly explained in the manual, often with examples. There is also an excellent tutorial in the manual that explains how to build an oval of track and get a power station coal loader working. This is an essential beginner's exercise. When you start with this tutorial, you can add buildings, create mountains, add more track and have a single baseboard layout up and running in no time. The tutorial only takes an hour or so, but within a couple of hours you can transform the baseboard into something terrific. Waiting for people to answer individual questions will eventually frustrate you and maybe even turn you off Trainz forever.
I noticed in another thread that you asked how to raise the level of buildings. Once again, this is covered in detail so that you can place buildings on top of, or even on the side of mountains. The manual is very thick, but it's an easy read and a fantastic reference.