Junior,
Here's a post I put up earlier for someone asking a similar question:
First, welcome to DR1. Your question is one that comes up fairly frequently on this board. The infamous saying around the island is "The easiest way to leave to DR a millionaire is to arrive as a multi-millionaire." While not impossible, it is very difficult for an inexperienced newcomer to do well right off the bat in DR.
The general advice, which I think applies here, is as follows:
1) First, move to the country, and spend at least 6 months to a year getting acclimated and simply paying attention to your surroundings. You can learn an awful lot by quietly watching what works and doesn't work in the country.
1a) You'll also learn what a realistic budget is, and how much money you'll need to make/supplement to meet those requirements.*
2) During that time, learn Spanish if you don't already have a solid grasp of it. Get to know as many people who can help you in business as possible.
3) Find a business opportunity (meaning some product or service in which an unfulfilled demand appears to exist) that a) YOU like, AND b) you seem pretty good at. Learn the true costs and requirements of it by working for someone who's actually got an established biz. You'll learn how it really operates, who your suppliers should (and shouldn't) be, which officials you've got to work through, and who your real customer base is and how best to reach them (might not be in a mall at all).
4) STRONGLY CONSIDER pursuing a business you can run remotely. Many people here work as freelance writers, translators, IT types, have e-commerce sites, consult, etc. That way you can run your business according to rules you are already familiar with, in your native language, and get paid at "home country" rates.
Either way, good luck.