Working overtime is a badge of honor in my field. "I worked 60 hours this week!" Who cares? That's 20 more hours of your time you're giving your time to someone else for just a few extra dollars. Good for you to come to this realization so early.Overtime isn't worth the lost time.
Now just dive in head first. There are enough threads around here that you can learn anything you need to start your business. If you haven't read the books, read those first.
Welcome and good luck!