I have volunteered with 4-H (Canada) for 42+ years (I keep losing track). I have lead 5 quilting projects - 2 of them during the lockdowns so virtually! have taught (with usually two more adults) anywhere from 6 - 15 kids ranging in age from 9 - 18 at a time.
#! Perfection is highly over-rated! Can't state that enough
#2 Use a stack of painters tape for a seam guide - sticky enough to stay in place, high enough to guide and removable and reusable.
#3 Stress safety - in a fun way. Keep your fingers away from the needle because I will take great relish in making the needle come back up.... don't bleed on the fabric ... using a rotary cutter will be closely supervised - always close the cutter to protect the blade - there will be penance!
Start with 2 1/2" strips - half WOF. Have the members sew them long edges together - 5 strips is a nice size. Usually by the time the kid has stitched four 1/4" seams, the seam allowance is acceptable.
Teach them to press properly.
Cut the strip set into 4 roughly equal blocks. Have kids trade blocks so there is a variety. Sew the resulting combination together - block set 1 + 2 1/2" strip+ block strip 2. Repeat with other set of blocks. Press well.
Birth with batt and backing - Block and backing right sides together. Pin together with batting on the wrong side of the block. Stitch 1/2" around leaving 2"-3" opening for turning. Turn, poking out the corners with a chopstick. Press lightly, folding in the seam of the opening. Stitch around the outside to close the opening.
Pin in the center and as necessary. Remind members to not pin where they want to quilt.
Machine quilt however the member wishes.
They will be imperfect but that is the charm of them.
So far my quilt clubs have done - strips, charms, bordered panel (quilting), Magic blocks (disappearing blocks), intro to landscape (this one was amazing!)
And no, I do not have nerves of steel. I put up with no silliness at the machines, cutting board or ironing board. Once the kid is started, I keep a distance but am always available. Having helpers who know sewing machines is crucial.
I had grey heair when I started.....