[Master of None]

I plan on running a gas supply line to my gas dryer. To make the final connection easier I plan on using black iron for most of the run then for the last 5 feet using flex copper. The black iron will be below the floor in the basement then copper thru the floor into wall behind dryer. Any special requirements that I need to know about before I run this line. I plan on installing a valve as the pipe exits the wall, before the dryer hose. Do I need to install a tee with a short nipple and cap for dirt collection? Is a mechanical compression fitting OK for the copper line?

Any help will be appreciated

Thanks