Indoor flying newbie questions

[KDdid]

While not a newbie to kites, I just discovered indoor kiting by stumbling on John Barresi's Zen Glider demo video and could not stop watching.  Ditto my 9-year-old grandson.  Naturally we want to try it for ourselves but I really have no idea where to start.  After a little looking around, I thought I'd order up an iFlight from the closest kite shop to me as a start.  That's a single line kite, yes?  

I also see what I think are dual and quad line indoor kites.  It's hard to see the lines and controllers in most of the videos.

I know how to do a few basics with my 30+ year-old Delta Wing dual line kite if I have good wind.  I can launch and land reliably without crashing, fly simple patterns across the wind and fly twists in and out of the line.  That's about it since I only fly about once or twice a year when my family goes to the beach where there is nearly always a lovely sustained onshore breeze in the afternoon and all that nice soft sand for when the kids crash my kite.  It's nose is starting to fray but that's a question for another part of the forum...  

So what do you recommend as a good starting place for my DGS and me.  He says, "Grandma, it's just so peaceful, can I watch it again?" and, "I want to be that" when he watches John's video.  

Thanks in advance for all the good advice I know is coming.