A good start would be building one small roller coaster, such as the the most solid choice available from the get-go, the Wooden Crazy Rodent (RCT1) / Wild Mouse (RCT2) , and with a custom design for money purposes exposed earlier. Hard mode option here would be a cheap Wooden Roller Coaster custom layout, which would however pay off if successful due to the coaster's high capacity and additionnal revenue from the On-Ride Photo section the competent player will never miss adding in any chance it gets. After that, a couple gentle rides and a thrill ride, as well as some stalls with correct park/ride admissions and one of each staff, and the park will be ready to open.
Players should then expand slowly, building more roller coasters and a few more flat rides whenever affordable. In RCT1, players will need a large amount of roller coasters to get 1,600 guests, much less in RCT2. Here, marketing will do the trick, with emphasis on Ad campaigns rather than free coupons.