Welcome to Trainz and to the forums, funnygrandad55. Trainz, as you are finding out, is both easy and complex at the same time. Even for us seasoned Trainz users, S2.0 is somewhat daunting and we will switch between the two as needed for different things. For many of us, we used Classic Surveyor for 20-plus years and jumping to the new version is a bit tough like buying new shoes and needing to get used to them. Some people have caught on right away and love it, while some of us find it overpowering. I'm in the middle and switch between the two.
Having said that, as a beginner, I highly recommend using Classic Surveyor instead of Surveyor 2.0. This will allow you to do everything you need to do without the new advanced features you can learn and use after you gain experience using Classic Surveyor since the principles are still the same and S2.0 is an updated version and is based on the old one.
To switch to Classic Surveyor on an existing route, click on the Tools icon located on the top bar in Surveyor and choose Classic Surveyor.
Once you do this, any subsequent edit will be in Classic.
Hope this helps.