I run a business similar to the one you propose in Santiago. It's good business, but you need alot more cash than you could possibly suspect at this point, also if you've never done business in the DR before then there is no way you are prepared for the world of bulshit you are about to enter.
Paranoia is your friend, anyone who you allow to get into a position to screw you will srew you, no promise made to you will be fulfilled, and you will be lucky if customs charges you anywhere near what you expected to pay to import your goods, while your competition seems never to pay taxes at all.
Also I don't know if you've been keeping track of the econimic situation here, but you may have noticed that inflation is still way behind devaluation, and may take another year to catch up.
When you buy in dollars and sell in pesos though, inflation is instantaneous, you've got to reorder at a higher price, and the way things have been going, if your merchandise stays on the shelf for 12 months you have to charge a 100% markup just to break even, and that doesn't even leave you anything for shipping and import taxes, much less overhead.
Come and see me when you're ready to start though, I would be happy to have a distributor in POP so maybe we can deal.