The best thing to do is go to your local citizens advice office. they can help answers questions and give you options – such as community led childcare which is much less than creches etc
The fact you WANT to work is a great thing, they will be happy to help you – often they are dealing with people who cannot be bother about work and generally I find they are helpful and supportive of people who want to earn their way but may need a little help.
Best of luck, let us know how you get on.
You could also ask your local TD for some advice, they have offices where you can call in and ask for some tips to get you back working and make it worth you while.
HTH – Best of luck, let us know how you get on.