How do income and expenses come into play?
Take a close look at what income you expect monthly from sources such as alimony, child support or salaried/part-time work. Then look at all your monthly expenses, including items such as rent/mortgage, car payments, living expenses, entertainment, taxes, medical expenses (including insurance premiums) for some examples. Be sure to document all these income and expenses numbers and revisit them a few times to ensure you are not forgetting anything.
Compare the two categories. Are your monthly expenses less or more than your monthly income? If they are less than the income, you are off to a good start and can begin saving this monthly excess amount to help establish your emergency fund for those unexpected expenses. If expenses are greater than income, you will need to review all expenses more closely to decide what needs to be done to reduce them.