You'll probably want to ask for a referral to a gender specialist, or a therapist who has experience dealing with transexuals (otherwise you may be shuffled around to a few people, like I have been so far). The waiting times to get into free services can get pretty ridiculous, so if you have the money you might be better off just paying for the therapy yourself. That being said, start saving, because if you're serious about transitioning, it's far from cheap.