So I'm thinking: -grip -stance -stroke -balance anything else???? what should we concentrate on for the very first session?
^You forgot "sand-a-floor!" IMO the foundation for the physical bits is footwork - I know, because mine is crap.
My 2 cents worth, Beginner -1.how to hold the racquet correctly. 2 How to hit shuttle correctly over head i.e inside out technique. 3.Focus on the shuttle when hits. 4. forehand lift with footwork and backhand lift with footwork.(holding the racquet correctly for backhand and forehand, REF: badmintonbible).When training a beginner, its important to explain the reasons why and why not.NEVER put down a player with negative comment.Once the beginner can hit and lift the shuttle correctly to the designated area then you can teach 1 step and 2 step footwork,net drop,how to move backward to do backhand/forehand clear and drop.Zhao Jian Hua and Xiao jie video is very good, go to badmitonconnect.com.
In my opinion, it depends how serious this player intends to become. If they think they will only play around at a social level for a few years, then they are probably not willing to invest time initially in developing better technique. Most people do not find it fun to learn and practice footwork repeatedly for instance. I think it might be a good idea to let them have a go themselves (teach them the basic rules of the game), and see how much they enjoy it. The hand-eye coordination might take some time to develop so in the first few weeks the goal might be to just hit the shuttle over as often as possible. However, if they want to learn the correct grips and stroke... http://www.jimmylin.org/badminton
Dont go to serious if they have never played cause ul jus put them off. Let them hit it a bit and ave some fun for a while. If they really enjoy it and want to improve, thats the time to get grip, hitting technique and footwork corrected etc etc. Even jus each time, focus on jus 1 thing. If it was me, id get their grip sorted 1st and show them how to hit it. Not going to techical and then hit about and have fun.
The first step is the grip of the racket. Besides that, just make sure they actually hit the shuttle consistently before going into techniques and footwork. There is nothing as de-motivational as not hitting the shuttle.