Again I would check out the book from the library, more knowledge is not going to hurt, even if some of it doesn't work out for you.
There is no real magic solution, you need to sit down and write out your budget for next month, start with your basic necessities; Rent / mortgage, basic food, utilities, transportation. After that plug in all other bills, if you have extra money at the end of the budget the apply that money to the smallest dollar bill and so forth.
If you do not have extra money and or your budget doesn't balance you need to figure out what you can cut out of your monthly budget.
being on SSDi you may qualify for other assistance programs.