Doing things backward.
In the DR many things are done backward, so, yes, get the job first.
So many issues. From the States, I have often been asked at airports about a return ticket. With one airline, they had to check with two managers who were present AND make a phone call to a third person, before letting me board after I showed them my residency!
So, if you have none of these documents, I would expect to be asked to buy a return ticket before "moving" here.
OK, so you are moving here...and THEN you are planning to look for a job? Finding a job in the DR is not easy. Plan for all needed expenses and then double it, and have that money ready before moving here.
Visit first on a vacation, find a place to live that you like and can afford, find possible job options and apply for them from your home country. Set up appointments to explore those jobs on your second vacation here. Don't expect to find work here. Jobs are scarce. Tourism is down. Fluent Spanish is a plus.
If you are independently wealthy, and you are only looking to find a job to meet people, or to improve your Spanish, there are plenty of places where you could work without getting paid to do that kind of thing. Lots of people in the Environmental Forum could recommend good organizations here in need of volunteers. I know of plenty of those organizations myself, so feel free to send me a message.
Finally, I had a work visa, and it did me no good. I had to get it in the United States at my local DR Consulate, not in the DR. Lots of time, lots of documents, couldn't do anything differently on visa that I couldn't already do on a tourist visa.
What you need is temporary residency which can be extended into permanent residency. Those are the ways you could actually hold a real job, if you are lucky enough to find one. Lots of stuff posted here about temp. residency. I have experience with that too. I expect to apply for permanent residency next year.
Don't move here and expect to find a job that pays you money.
Kevin