Hi Steve,
I would suggest you rent for a year while you figure out the right community for you and your family and the stile of living that makes you happy. Properties take on average a year or more to be sold, there is a glut of properties available as people move to the states looking for jobs, so if you get a place and later change your mind it will be hard to get rid of it.
As to business, if you are talking about a service business where the customers are at least 90% outside of PR, you should look into Act 20 and Act 22. These are plans so your corporation only pays around 4% PR tax and Zero federal. I believe only service is covered. One of them is for investors and the other is for services. Not sure how long these laws will be in effect, you have to apply for them and wait to be approved, you must live in the island full time, your corporation must be also registered in PR. Check with a local tax lawyer. Forgot, under those laws you are REQUIRED to donate around 10,000 a year to a government selected charity so depending on your volume, it may not be worth it.