Hello - you can definitely file a divorce PRO SE (self representation). I do not recommend it if there are children involve. It's very possible for an attorney to request the opposing counsel and defendant to pay for some or all of your legal bills in the divorce case.
I suggest you go down to the Tennessee State Bar and check if they have legal aid program for indigent citizens.
You can start by reading how to approach the process:
Under state and federal law, you have plenty of rights as a mother. Unless you neglect, abuse, or abandon your child it is almost impossible for you to involuntarily lose your child. You will need to establish paternity with the child's father and file a petition of . Equally you both have rights to the child, and it is quite possible for you to have joint custody of the child and you as primary.
You will also need to file a Petition to Establish Child Support for the child, based the obligor's income/sources. You both can also agree on a child support amount without going to court to fight it out. You will, however, will have to draft up agreements on this amount, the duration (until child is 18 or 21, etc). If the divorce is contested (you all don't agree) you may have to contact a licensed divorce attorney.
If you decide to run away with the child - that would not be a wise choice. You could be charged with kidnapping or child abduction. I hope you don't choose that route.
Here is a helpfule site to view and use - http://www.selfhelplawcenter.info/
Thank you and Good Luck!