Start by picking which side you will build in. I chose the left as it has less trees. After selling off the paths on the right, I started by building the gentle rides, a Magic Carpet, and two Side-Friction Coasters. Side-Friction is not the best to build with, but it's all you have at the start. Do remember to charge a reasonable price at the entrance, but research is not a priority, as there is not much more to have, but some more roller coasters should be what you want at first.