Phanie11, first of all welcome to the forum! Do not take this the wrong way but based upon your posts I'd suggest more BASIC research on your own from your computer before you come here.
Asking basics such as cost of airfare, cost of housing, safety, etc. is stuff you nail down prior to coming here. Cost of airfare - depends on where you're flying from and where you're flying to, days of the week, season, etc. You can research this on your own through Orbitz, Travelocity, Kayak, etc. Since you know what airports that are near you, that's step one. Step two is where to fly to in the DR? What area are you interested in? East cost (Punta Cana area)??? There is a Punta Cana airport. Can you get flights there from your home airport? South Coast (Santo Domingo, Boca Chica, Juan Dolio, etc)?? The major airport in the DR is in Santo Domingo. Much more flights here than anywhere on the island. North Coast (Puerto Plata, Sosua, Cabarete, etc)??? Flights to Puerto Plata are few from the US and pretty costly. Some of the roads that are shown as major highways on the maps here are small congested roads through the mountains where in certain parts you need to drive extremely slow.
Zero in on the area that you would believe that would be the best fit for you. You can do that by research on the computer. Google the various cities, look at the information on the towns, use trip advisor and other references to see what in each locale (use they map feature to see how close restaurants, shops, hotels, etc are.
Once you think you're interested in one area over the others do more research as it is not easy to go from east coast to south coast to north coast - very time consuming and costly if you don't use local bus service. If you're not planning on a quick visit using a hotel, check the web for long term rental options. Check the prices and read the Google review, Trip Advisor reviews etc.
If you think that getting a passport is a lot of work, and plan on staying here longer than 30 days (at a time), be prepared for a 10 fold more difficult and COSTLY process to get paperwork for long term stays (Visitor Visa, Temporary Residency, Permanent Residency). If you're looking at staying here long term also read the First steps to Residency tread.
My wife and I have been here about a year having spent time on the east, south and north coast and all have things that we like and things that we don't. So far we've found that the north coast (Sosua/Cabarete) the best fit for us. We're still learning as we go from the great folks on these forums and the locals here. It's a process, but for us well worth it!
Please do not take these points as any way to discourage you, but as friendly advise. The more work you put into your research the more likely you will know if this is the place for you or not. These forums are VERY HELPFUL once you've done some basic research. From your questions I don't believe you have. People here CANNOT answer some of the questions you have because you're way to vague at this point.
Research then narrow it down that you believe you're interested in then I believe you will get much more out of the forums. People are here to help (myself included) but some preliminary work needs to still be done by you.
Good luck!!!!