How to teach an undergraduate course without having taken that course formally before?
The more I think about this, the less I like it.  A summer course is SUPER ACCELERATED.  You blink, and the course is half over.  The opportunity to fix problems that arise is tiny.

I hope this is a low-credit course, as I really encourage you to stick to a workshop-style approach.  Teach by example.  This will essentially be a "getting started" guided tour.  Pick a problem, and walk the students through that problem during the summer session using a number of the tools you're trying to teach.

If you can find somebody that's taught this before, make that person your best friend.