Questions on Applying for a loan for an established gas station?

Hello,

I am wanting to start investing my money when I turn 18, I am 17 right now and I am thinking of ways on how I can purchase a gas station to run. My questions are when I apply for a loan can I use a personal loan from wells fargo or a federal credit union? Or does It have to be a SBA 7a loan? Also, when I am purchasing a new gas station can I use there previous business plan for the loan?

Thanks!