Fun! Nothing like fresh peas. I like to just eat them in the garden.
You can shell them and steam them if you like. Yes, put them in a stirfry too.
Don't let them get too large before you eat them. They are best when about as big around as a pencil. They get tough and starchy if let to get too mature.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-