Negotiating a oil, gas & mineral lease

I own Oil , Gas Minerals and Surface on 79.24 acres of land, more or less, in the Robert Butts Survey, A-94, in Leon County, Texas; landmen representing Chesapeake Exploration, LLC, P.O. Box 18496 Oklahoma City, OK. 73154-0496

have gotten several elderly neighbors who own large tracts to sign on.

1. Is $400 per acre and 1/4th royality- a fair offer with no rentals

2. Does anyone know antthing about shut in clauses.

3. What's the best way to prevent the Oil Co. from making all the money and I get chump change- every once in a while; because If production is good long term then I want to be well compensated.