Hello Andrew, welome to the frustrating world of Trainz. Do you know Trickboy by the way? You get more help if you register your copy of trainz. That way people know you have a legit copy. Hence the previous post. To make a consist (fancy name for "train") go into surveyor, open locomotive tab on the right side of screen, select what you need and place on track. Save route and session, exit surveyor. select route, session, drive session. Quick Drive? thats a laugh! Ignore quick Drive.
Add a locomotive and whatever cars you want. Go to the consist tab and use the get consist button. Click on the train you made and name it. You can then use it in Quick Drive.
Rob