I have a few questions and hope that some one out there can help me with the answers

In a couple weeks my finance will be here in the states and we plan on getting married. He will only be staying for aprox. 10 days or so and then going back home to New Castle. We have both decided that it would be best if I came to live with him in the UK. There are many different factors for this decision, immigration to the US is a lengthly process and there just isn't any work for him here either, he works off shore on oil rigs.
So I guess my questions are the following:
1. What do I need to do to get a visa to come and live with my husband in the UK?
2. I have a son that is 5 and he will be immigrating with me as well, how do I handle that?
3. Fees for the visa's?
I appreciate any answers that anyone can give me! Thank you in advance for your responses!!