Hi dibsmo and welcome!
I would highly advise that you get your cat spayed ASAP. Spaying her as early as possible (preferably before her first heat) is the best thing you can do for her. To breed cats you need to be a professional and knowledgable breeder, committed to the standards of ethical breeding. I think it's a fascinating field and should you wish to learn more about it, I'm sure you can get a lot of help here. One thing is sure, if your cat is already in heat, you're too late for his heat cycle - learning just the basics of proper and ethical breeding will definitely take you more than a few weeks.
Just for starters, you need to know a lot about your cat's genetics. Breeding without that knowledge could lead to a serious of serious defects in the cats. I just checked out in one of my books and with Siamese you are looking at these potential problems: weak hind legs, visible kink in the tail, malocclusion, protruding sternum, heart problems and kidney disease. Even if your cat is healthy and the male is healthy, they still could be carriers of faulty genes and you may get sick kitties. That's one reason why breeding purebreds should be done only within a professional breeding program by someone who is thoroughly familiar with the blood lines involves. Other than genetic problems, you will also have to check your cat as well as the stud for FIV, FeLV and FIP - if anyone of them is a carrier you can't let them mate. Be careful - those are lethal problems!
And all I've said up to now is really just the tip of the iceberg. I myself am not a breeder - right now I can't afford the time or money to do that properly. And as the risks are so great when this is not done properly - I think the responsible thing for me is not to breed at all.
And as Denise so rightly said, there are so many Siamese looking for good homes out there. Here are links to rescue organizations that rehome Siamese cats. I'm sure that if your friends really want to give a good home to a Siamese, they can find their furbaby here:http://www.kcsiameserescue.com/http://www.siameserescue.org/http://members.petfinder.org/~MI235/http://ks.siameserescue.org/http://www.siameserescue.org.uk/http://www.purrsabound.petfinder.org/http://tx.siameserescue.org/
There are actually many more - but I'm sure these can help you. Please help rescue a Siamese in need - there are kitties out there as sweet and beautiful as your cat that need good homes. There is really no need for you to breed her. You can also read more about the benefits of spaying and neutering here:http://www.thecatsite.com/care/spay.html