a) Have a title search for “mineral rights” for the property that you own. Until that is done, everything else is moot;
b) Take a copy of that lease to a local attorney that specializes in oil and gas leases, and have him/her explain every clause in it, to you. And what his recommendation is.
Oil and gas leases are _extremely_ tricky. It wouldn’t be inappropriate to get a second opinion on the legal aspects of the lease you are offered.