i personally think its easier to go to uni, my uni course is only 2 days a week, most FT degrees are, plus is nice to get out of the house etc.
you need to apply through UCAS but you are too late for Sept 08 start. you can apply to start Sept 09 from the beginning of Sept 08.
you will need to, closer to the end of this year, contact student finance direct for application forms. on-line website can help.
my uni charges £3000 a year for my course, but i get that paid in a loan to me, which i will pay back @ £5p/w once i earn over £15k, straight from wages.
Most unis etc have nurseries on site for your baby to go to, etc.
then after those costs it is relatively cheap - i dont buy books becuase our library is well stocked and use journals alot. travel costs are minimal too, as i car share.