Hey conclue. You start at the beginning and keep going til you get to the end. You have the challenge of working with the tools you are given so be prepared to amend your ideas to fit what is possible.
The roller coaster you quoted above could not be built without an extreme knowledge of spacial concepts. Or do what I did. I made a 5 story building as big as possible on a 64x64 lot and put the roller coaster into it. Then I deleted the building. There are a huge number of challenges to overcome. It is glorious to click on the starting track and get the 'This track is valid' message. It took me more than a week to build the original inside the building. Then it's been a couple of days fixing it up since then. That's why I'm over roller coaster building. But I have a few to play with now and they are fun to play with.
