Did it, loved it, would do it again if I could. :) My surro-doodle is now 5 years old.
I started my research at www.surromomsonline.com and read this book: http://www.amazon.com/Matter-Trust-Guide-Gestational-Surr...
Six years later, I'm sure there are more resources.
I was matched through an agency, as I wanted professionals to handle everything. I went through Texas Surrgacy Solutions, which was run by an attorney would had children via surrogacy, and an infertility counselor, Wendy Bauer. From the testing I had to go through to the first meeting with my Intended Parents, signing contracts to taking care of the prebirth order, they handled it all.
It was, without a doubt, the most amazing, awesome, wonderful thing I've done in my life, save for having my own children.
The drawbacks? Shots. Huge, intramuscular shots for weeks on end, causing horrible bruising to my rear end. Horrible morning sickness. Being pregnant but not getting to decorate a nursery or shop for baby clothes or dream about names. But NONE of that is anything that would stop me from doing it again, if I could (I've had 4 c-sections with lots of scar tissue, so no more pregnancies for me). What small issues there were were so m easly compared to seeing my IM hold her baby.
That said, I had great IPs. I've known plenty of surros who don;t get along with their IPs. My IM had lost five pregnancies, so she was prone to worry. Some surros can get pissy if they feel like their IPs aren't trusting them or are too demanding. I think that's hogwash & I did everything I could, everything that my IM wanted because I was carrying HER baby. My body, sure, but HER baby.
The contract is VERY specific. You can see examples at the site I gave you, I believe. Your IPs will pay for your own attorney to help you with the contract. If you go through an agency, they may have an attorney they use for surros; otherwise, you can find recommendations at the site as well. Experienced surros are very helpful & willing to share info, links, stories, copies of their contracts, etc. so definitely look at the message boards there.
Another awesome source of info are the surros' blogs & online diaries. The most helpful place to me during my surrogacy was the Yahoo group TOSS, Texas Oklahoma Surrogacy Solutions. A fantastic group of ladies! We had pretty regular get-togethers, which was fun.
I could talk about this subject forever, really! I'll stop now, but if you have any more questions or whatever, please feel free to email me. I'll also direct my bestest bud Tiff here; she was also a surro & we met through TOSS.