Marrying a UK citizen - I have a child from a previous marriage

Thank God for this site - that's all I gotta say!
I have a somewhat unique situation. I live in Florida, my fiance lives in the UK at the moment. I have a 3-year-old son from a previous marriage. We want to settle in the UK, and I'm wondering what the easiest way to do this is. My ex-husband will sign over custody, that's not a problem, but do I need seperate visas for both of us? What visa do I need for him if I get a fiancee visa in the UK? Is the best route to take having my fiance come here to get married, then apply for a spouse visa? Lots of questions - any info would be great!!

Actually everything in your case sounds pretty straight forward.

There is a thread currently going on that is talking about the benefits and costs of getting married in the UK versus the US: http://talk.uk-yankee.com/index.php?topic=25972.0  Both options are open to you.  There are a lot of considerations including fees and costs and there is no clear cut answer.

Your son would need a VAF2 Settlement Visa and come over as a dependant child of you.  You would apply for this at the same time you apply for your VAF2.  A great place to start is: http://www.ukvisas.gov.uk/ and will lead you to all the right forms.  You will need a formal legal document stating that it is ok with your former husband that you relocate to the UK.  You will also have to provide legal proof that you are divorced.