Nesta, I took the FTDNA Family Finder test a year or so ago on special offer for $99. Results are interesting and much as I expected. (I'm female)
They give you a nice map showing where you 'originated' and it also gives percentages of ethnicity though you do not know whether locations are from maternal or paternal ancestry. It is very non specific though.
There are links to 'cousins', most of which are American - none of the surnames I recognize as being families I have come across in my research, so any common ancestors are probably further back in time and may not be findable via a paper trail. As the tests are more popular in America results will generally have an American bias.
You can get a FamilyFinder test for anyone. Initially perhaps you could test your son as his results will include all of your and your husband's ancestry. If you find it useful you could then go on to other tests in the future (these companies do regular 'special offers').
https://www.familytreedna.com/learn/test-types/autosomal-dna-snp-test-family-finder-test-will-learn/A Y-DNA test for your husband will trace the male line. You need to test as many markers as you can afford.
An MTDNA test for a female will trace the female line. (though it can also be taken by males)
A couple of years ago both my father and husband tested 67 markers and neither have any useful 'cousin' matches as yet (which is what we were hoping for). My husband, with one of the most common names in the UK has
no matches, I think due to lack of numbers in the UK being tested. However my father's (distant) matches have given us some further information about his origins - though the results are obviously skewed and reliant upon others who have tested, which may change as more and more people take tests.
So a Y-DNA test for your husband,
may throw up a lot of names from a particular area of the world.
I'm not sure I explained that particularly well, but I hope you can get a grasp of what I am trying to say.