Gas line for pool heater

I am purchasing a pool heater. My pool is at the end of my yard about 75 feet from my gas meter (meter is inside my house)
I am going to hire a plumber to run the gas line but always like to have knowledge of task before hand. The gas line will run under ground.

How deep does the pipe have to be buried under ground 18”, 2′..?
For 75 feet how thick should the pipe be ¾, 1”..?
Do I need a shut off value at the start of the connection?
Should I shut off gas at the end of season?
My bar-b-que grill is 10′ before pool. Could I tap on another connection on to pipe to feed bar-b-que grill?

I have a 10X16 pool. The pool heater will be a 100,000 btu.
What is a comfortable temperature?
If anyone has a pool heater (my pool will only be used on weekends), what are the logistics with pool heater usage and what is the typical impact on the gas bill?

Thanks.

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