A lot of the answer has to do with how your child care situation is, and whether you are done with school.
If you have someone who can watch your child, then you can get a job like most folks do, which means searching for them on Craigslist and setting up a profile on Monster.com and other job hunting sites.
You can also do it the old fashioned way and get a local newspaper and go through the "help wanted" section of the classifieds.
What you should NOT do, is do NOT go into anything that has ANY kind of fees or start up costs or that involve selling something as part of a "network" or "multi-level marketing" program. Basically, anyone who offers you a "great opportunity" and who seems really, really interested in getting you to join up because you can make lots of money is lying to you. So ignore them. Same goes for anything that involves selling door-to-door. Don't do it. You will be miserable and make no money. Plus you expose yourself to unnecessary risk, all for the promise of great commissions you will NEVER make. Real jobs require query letters, sending in resumes or filling out applications, and doing interviews. Period.
Also, check with your school councelor if you are still in school, or check with women's advocacy organizations, there may be some assistance to be found through charities, government organizations and even churches (although watch out they don't try to drag you in on Sundays with dripping promises of love and acceptance all the way to the collection plate, etc.)
Bottom line, look around. Be proactive. You're going to have to do the WORK required to GET work. It won't fall into your lap, but there are jobs out there, online and in the "real" world.
If you are disciplined and work at seeking employment every day for as many hours as you have to spare, you will find it. Discipline is the answer. Good luck and happy job hunting. :)