brit in uk

i want to live in canada i am a single parent and don't have much money i have a boyfriend in canada and a brother who has lived in canada for about 17 years and has canadian citzenship where do i begin anyone help me please ...my boyfriend is still married but seperated from his wife and cannot afford to get a divorce just yet.. what can i do ...

Check out http://britishexpats.com/forum
Are you a professional of any kind, do you have a degree, do you have experience in a particular skilled job? If so, you may be able to get your own status.
If not, was one or both of your parents born in Canada? If so, you may be a Canadian already.
If not, you might have to wait for your boyfriend to divorce and sponsor you. Because you are a parent, any immigration application would have to include your child. This means that the father, if living, would have to approve your move to Canada. Also, you or your sponsor would have to have money to meet expenses for both of you. Single people coming to Canada need $2500, I belive. You would have to show access to $5000 or more.
It might be very hard for you to move to Canada but good luck in your quest.