You start the park with $10,000, but can only borrow $10,000, so start by adjusting the prices of food and souvenirs and getting rid of useless staff (a few handymen, mechanics, and guards can be sacked to decrease your running cost). Don't start building roller coasters straight away, but build smaller rides to keep your guests occupied while also running promotions (half-price entry, free food, free ride) almost continually, it will get you a steady stream of money to build a little nest. Build roller coasters during the last year to get to the $320,000 objective.