Just remember that being self_employed means that you must also pay the self_employment tax, so include this in your calculations. The self_employment tax is double what you would pay in Medicare and Social Security taxes if you were employed.
The most important of these is automatic savings. Open a savings account, and set up your checking account so that you automatically transfer a set amount each month into your savings account. You don't have to transfer much money _ start with whatever your budget can afford. But making this automatic (and then resisting the urge to spend the money impulsively) will get you on the road to long_term savings.