I start off by building a couple of flat rides and then start on the first rollercoaster, usually the Steel Rollercoaster. I charge $5 for the rollercoasters and the default amount for the rest of the rides. After a few months you should begin to see some money if you are running your park right. You may even want to build a small shuttle looper to raise some extra revenue.
That's exactly what I was thinking, Rampagelover!! That's the perfect solution.