Establishing Business Credit

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Hi,

I plan on starting my own business in about 5-7 years (HVAC/Electrical Service and Installation). However, I was wondering if it would be a good idea to create the company name and establish the LLC sooner, so I can get a head start on establishing business credit. Or should I wait?

I'm 23 years. My credit score is 750. I have 2 major credit cards, and no debt. My credit history spans nearly 3 years. I've never taken out a loan or financed a large purchase.

If I start out now, will my business credit score be zero? Or is my credit score a factor as well? Would it be like co-signing for myself?

Any help would be greatly appreciated.

Thanks