I'm trying to start a small business and I need to know how customers can pay me from across the country?

It started out small, with people I knew but soon word got out and people are asking for my product from other states. I can send it through UPS or FedEx but I haven't figured out how they will pay me. I don't want to use my bank account, just in case. What options do I have? Thanks in advance.
Update: How do I use Pay Pal?
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