You definitley need some type of credit, when built up it can be a life saver at times and allow you to access funds you may really need and wouldn't have had otherwise. I'd get at least one credit card to pay some of your otehr stuff off and pay on that one card. You can even geta secured line yourself from a bank for a couple hundred dollars that'll keep you in check since it's your funds, but will report on credit as an extra line.
Beleive me it will help in the long run
Sometimes if you had great credit history in the past (some people just decide to cut up their cards so lines are still there just unused), or even if your starting out and just don't have much credit. Sometimes a lender will want something currect so in my case I can setup financing with alternative tradlines such as cell phone bills, satellite tv, really anything that's paid as an installment or consecutively. But not every lender accepts that, and its a pain.
But like Scott mentioned Paypal should be fine to use.