There's lots of part time adult college courses in Teacher qualifications out there. But before please make sure it's something you really want to do. I love the practical side of 'teaching', I used to always get asked to oversee the work experience girls and junuor at work and I absolutely loved it. However while I was doing my second year at college (L3) I realised I could never become a tutor. I was asked by my tutor to take a group of Level 2s for a supplementary theory class as there were some who were struggling to keep up. I spent about half of the first lesson explaining the difference between pore, pour, paw and poor to a bunch of 16 year olds. Yes, 16 year olds, who had completed their 'basic' education. Sometimes I was asked to keep an eye on the L2s if the tutor had to go somewhere for 10 minutes and it was TRYING. Eventually they realised that just because I also a student didn't mean I'd let them get away with swearing and playing up as I was the one responsible for them at that time, but it taught me that it was personally something I was just not cut out for.
So the moral of the very long winded story is.... Please be sure. Obviously there are many amazing people out there who ARE cut out for it and I'm sure that you are one of them, but before you invest your hard earned savings be 100% that you can cope with it.