I am a former teacher now working as a childminder. I co-childmind with another former teacher.
Yes, childminding means long hours and a lot of paperwork. But I can promise you, and assure other people, that the paperwork is NOTHING compared to the paperwork you do as a teacher. And you can set aside one evening a week to catch up (or less as you're so used to it) - something a teacher can only dream of.
You need to be aware that it pretty much takes over parts of your home; and resign yourself to the fact that you haven't finished with Ofsted...
Being a qualified teacher is a big plus as far as filling places is concerned. You can offer term-time only; you should be able to fill the places easily.
You can't hope to make as much money as you make now, but you should be able to make a reasonable income. You don't say where you are, and of course childminding rates vary. We're in the south east and currently charge £58 per child per day.
To make sure you do have a reasonable income, charge by the day (eg 8am - 6pm, 10 hours a day) rather than by the hour. Families can then use the hours as they wish - if they want to bring their child at 9 and/or collect them at 4, fine, but with no reduction in charges.
As for funded places - we don't offer them. The reimbursement you get is certain to be considerably less than your normal rate (for us it was £4.25, which worked out at £906 per child per year). You end up subsidising families who almost certainly (and certainly if you're term time only) earning more than you are.