The GMC homepage is where you want to go:
http://www.gmc-uk.org
Specifically, you can go to the site map here
http://www.gmc-uk.org/global_sections/sitemap_frameset.htm and click, under Registration, on the link to "Accepted Qualifications." You'll get to a flowchart that explains this.
That should answer your question about whether your degree qualifies; then I would suggest going back to that site map and reading all the sections under Registration, particularly PLAB and IELTS.
This is a very confusing website, but don't let it scare you too much.
That is probably the best place to start because they will basically be the ones to accredit you.
The closest UK version of the American "Iserson's Getting into a Residency" is
So you want to be a brain surgeon by Ward and Eccles. I have a copy, it is pretty useful if you want to look up the details, competitiveness, salary, training process and qualifications, societies, etc for particular specialties. If you're serious about the move and want to learn more, the book is worth getting because it's very informative, although it does not offer much in the way of tips for how to succeed in getting a post.
btw, if I had to do this over again knowing I was gonna marry a Brit (and assuming we'd decided what country to stay in) I wouldn't bother with attending school in one country, then moving to the other. I would have simply made my applications to med schools in the country I was going to stay in. It is a lot of trouble to climb up the medical ladder in another country, especially if you've already done it once.
Medical training takes so many years that it is simply not worth doing twice just for the novelty of a different country, and it's also pretty humbling to be in a place where your application for a post may be looked at last or thrown out. IMO getting trained in one country, then moving to another for postgraduate training in medicine is not pie in the sky-- but that doesn't mean you can't do it, just that you shouldn't do it lightly.