Hi R.,
Couple of things, one, you are not alone. I was in a similar situation, luckily my son's (he's 15 months old) father does try to see him from time to time, and occasionally we get some money. He loves his son, sometimes it just takes some time for them to come to terms with reality. But that is not always the case. I know a couple of other single mom's that the dad is just not in any way around. It can go either way, but as I said, remember you are not alone.
I started a "club" for single moms a couple of weeks ago. There are a lot of us in your shoes. If you would like I can add you to the list and you can get some real support as well. We also do babysitting coops.
Now, as for child care, I ran into the same problem. You have a couple of options, start looking NOW for a good quality home day care setting. They usually run about $180/week for a decent one and some centers you can find for about $200. One of our single moms has a center downtown that she pays $205 for? Depending on where you live/work you can find some decent prices, but you also get what you pay for.
I personally decided it wasn't worth it. I quit my job, sold my condo, sold the majority of my stuff, kept my son's, and moved into a studio apartment until he was a year old. I had some money put away but not a lot, I spent a couple of months deciding what to do and settled on being a nanny. I get all the perks of being a stay at home mom, and don't have any of the financial burden.
Money wise, it isn't even all that much of a sacrifice. I was making about $50,000 and after taxes (I don't pay them now) and day care fees, I am only making about $350 a month less than I would be if I was working full time at a comparible job. Plus I would have to be working at least 50 hours a week, plus commuting time, at the end of the day I would spend only a couple of hours a week with my son. That wasn't ok with me, so I found an alternitive.
They are out there, and available, you just have to look hard enough, and think outside of the box.
Any way you decide to go, lean on others around you, come to a single mom's club meeting, join PWP, etc. It does take a villiage, particularly when you are doing it alone.
Best of Luck,
Jen