For the last 20 years or so I've been a fireman. During this whole time I've also had several of my own businesses that I ran on my days off. (explains the graying hair)
My starting capitol was generated by anything from savings to borrowing from family. I've even had a friend insist that he co-sign for rather large line of credit for me, which we took him up on. Use your resources and imagination, but, be VERY cautious about getting in over your head at the start-up. Sometimes money is TOO easy to get and if the business doesn't succeed you could be stuck with a huge bill and a bruised ego. The difference is the damaged ego can heel quickly. Either way you go, GOOD LUCk to ya. You never said what you might be getting into. Is it a secret?