I would sign up for salongeek.com and take a look at the forums on there. Also there's makeupadviceforum, although you need special access to get to the pro boards for advice you can post asking for advice on the open boards.
I have looked into this time and time again. My research has left me believing the following:
You need to go to the best school, which I think is probably School of Makeup in Stockport (for north west - this is where I am too). They have the best contacts and will be able to help you get paid and unpaid work doing makeup and hair. You will need to do lots of practice before you can charge - they told me when I went for a look around that if I am good, and reasonably able, it would be 'a few months' before I could advertise for paid bridal work.
You realistically need to do hair too. Not everyone does and certainly there are bridal makeup artists making money who can't do hair - but, you will find many brides want a package deal.
The amount you can charge depends on local demand. I personally think in your area (kinda my area too
) that demand is high, and you can charge a decent rate. I was looking at £120 for hair AND makeup for bride, £60 for other members of the bridal party. This is about what I was quoted for my own hair and makeup in 2008/09 and it's not gone up much. The most expensive (and very talented) artists are Peaches and Cream and they charge more than double this amount - and they're booked up to the hilt.
You will need to spend a lot of money on kit.
You will need to do work for free to get your name out there - modelmayhem is a good way to get time for print shoots.
Hope this helps. I am not going to be doing it for a few years as I have got a part time job that I enjoy and have two young DDs, but it's something I really desperately do want to pursue when I have more time and money - probably in 3 years. You can make money out of it if you're business-minded. And PS most artists charge separately for trials, they wouldn't be included in your pricing - but you'd be looking at £25 ish for a trial.