Woah, don't do it man. You know it ain't going to go well for you. I heard of a story where this guy took care of somone ele's child then the child basically ignored anything the guy did and only liked the father that left 'em then there was the break up after that
I've known a lot of single moms (didn't date any of them, but had many as friends since I love kids and my wife and I can't have any), and from my experience (albeit skewed), they seem to often like one of two types of guys:
A) Single, carefree bachelor -- perhaps the worst type for their situation. I think the reason they're drawn to these types is because their whole life revolves around work, kids, work, kids, endless loop. They want to kind of break away and be with someone who makes them feel like a single woman again. The other might be that they're just looking again for the type of guy who would leave them alone to take care of kids.
B) Really responsible guy who loves kids. This is usually the more mature types, but they might be interested in a very secure type of guy who's really into their kids with the hope of sharing the burden and having a good future for their children.
I don't know which type you fit in, but you might give the perception of being one of these two.
All the good ones got taken already bro. You are left with chad's sloppy seconds. Look for girls on arrangement or girls looking for relationships with older men, then maybe you can meet some young women.