I was a sahm till my son first started school.
At the moment you can remain a sahm, but the rules are changing soon, and the new government is in the process of changing the rules again on the age your child is when you have to change from income support to JSA to make it as low as 5yrs old. So this will beome an issue for you in a couple of years time, possibly sooner.
As it had been a long time since I had worked I started off with a job at our local play group. The hours fitted in with school, it lead me back into work gently, I worked 16 hours a week so qualified for CTC & WTC, and I didn't have to worry about holiday cover as play group was closed in holidays too.
Maybe you could look for something similar to get you started back into working? Lots of schools need class room assistants too, and to be honest the conditions and benefits are better if you can work at a school rather than a play group.
After a year I was then ready to move on to an office based job, more in line with my qualifications and what I had done before. I was very lucky to find a job which offers flexible hours, though empolyers do have to try and offer these if you ask for them now.
Child care is a big issues, there simply is none where I live. No after school club and no holiday clubs near to home. You may wish to consider this in your choice of primary school.
I used to have a child minder, but she quit after a few months. No family help snd no ex so I have to sort it all myself. I decided my best option was not to rely on others and to work school hours in term time so I swapped to this. I haven't had to swap again luckily.
I now work school hours in term, longer in holidays but get time off in lieu plus my usual holidays. I use a holiday club near to work - but it's only open in Summer and Easter. Used to have another really good one available near work, but that had to close because the school they used put their rent up so much. It is expensive but I get help to pay for it as I qualify as a lone parent. So bear that in mind when thinking about your options.
Never been married so can't advise you on housing stuff sorry, others will be along who can though I'm sure.
A really good source of info for me was the lone parent advisor at the job centre. You can make an appointment to see them and they will work through your options and tell you how much better off (or not) you will be once you find a job (or are looking).
Try and sort out the situation you're in re house, maintenance, contact arrangements etc first.
Look at this website for some advice on parenting plans etc, you may find it useful.
home.clara.net/spig/
Good luck. It can be tough but you'll be fine. Come here for support and advice when you need it. Best wishes