Not a problem at all craigdon. That's what the forum's for.
If you go to 'edit route' in surveyor, then in the train tab to the right, select any rolling stock you may wish to add. There isn't much on a fresh install so you may have to open Content Manager (CM) and search for locos, carriages, etc. Most of the BR modernisation locos are there, Mk1, Mk2, Mk3s, and some first generation DMUs. There's also more modern stuff too. Just select what you want and download it. The only issue you may encounter is sometimes a loco or carriage won't automatically download one of its dependencies such as a bogie, or brake pipe, etc. If that's the case, right click on the downloaded asset, select List Dependencies, and you should get a new CM window open with the missing dependencies in it. Download these and you should be good to go.
Once you've placed your rolling stock, save the session and switch to driver. Fingers crossed you can jump aboard and get going.
Cheers,
Innis