I'm a midwife. I trained 10 years ago so may have changed a bit since then.
Competition as hurricane says is fierce. Most unis expect relevant exams/access course and experience. So volunteering, shadowing a midwife, working as a HCA. You will need to be up to date on current midwifery issues and be very at home with the language of midwifery (individualised care, maternal choice, supervision blah blah blah). Your local uni will probably let you use the library as a guest so you can go and read some midwifery mags to give you an idea of what's going on. BJM and practising midwife are good.
The course is hard, and I did it before my DCs, but plenty on my course had children, so it's very do-able. Having life experience is helpful of course. Expect long nights and days and lots of coursework/reading on top of that, and if my uni is anything to go by, little flexibility or understanding of the difficulties of childcare (changing lectures at the last minute etc). The attitude was very much that we should all be grateful for a place because there were 20 other people who didn't get our place who wanted it.
Whether there are jobs at the end of it or not depends very much on the situation in your area. The universities usually train the number of midwives that local trusts ask for, so only 25 places suggest there may not be loads of jobs where you are. Where I work, for example, the local uni trains I think about 100 midwives a year.
Being a midwife is intermittently awesome and awful. Be prepared for a huge responsibility, lots of stress, dealing with terrible, tragic situations, reams and reams and reams of paperwork (I mean really way more than you'd ever expect) and the constant nagging fear that something you did a decade ago will come back and bite you very hard on the arse. And every day knowing that a crap decision by you could hurt or kill someone or their baby.
The upside is great of course, birth, breastfeeding, helping people in unforgettable ways.
Given my time again, I'm not sure I'd do it, if I'm honest. But ask me on another day and I can't praise it enough as a career. It's a rollercoaster, put it that way.
Good luck.