Blank canvas, steel sided 40x60 pole barn. Thoughts on insulating, electrical, heating???

Back in good ole Mo. I cooled about 1000 sq. feet of my humble abode with a 110 window unit. Never turned it on till maybe noon, and it kept it perfect all day. 100 degree days no issue. I did build it with 6 inch wall studs and insulated it well with bats. It was what we call a "barnamenium" here in Tx. I just called it a pole barn home, as that was what it was made of!! In other words, a well built garage!!!!