I am hoping you already have one aircraft based upon your website....otherwise you are a little behind the curve.
FYI----you do realize you need an FAA drug plan etc to do the tours and rides? Or do you have a 135 certificate?
Most leases are typically for $X per month plus an hourly usage fee. You will be responsible for insurance and maintenance. The biggest pitfall you will encounter is the generating enough income to support the monthly fee----especially in PA...do you have a captive audience or tourist base in Hershey?
The other major thing to be careful of is that one mishap can put you out of business unless you have lots of money.