I'd have your kids watch the movies as they were released...
OT Trilogy (Ep4, Ep5, & Ep6)
Prequel Trilogy (Ep1, Ep2, Ep3) (your kids are young, so they'll still love Ep1 & Ep2)
Clone Wars movie + series
Skip the sequel trilogy (Ep7, Ep8, & Ep9) Don't bother.
Mandolorian S1&2
And, if your kids are getting into reading, there's no shortage of books that take place thousands of years before the movies, in-between each episode, in-between the trilogies, and directly to decades after the original trilogy concluded.
I was at a used book store the other day, and old paperbacks are DIRT cheap... like a few bucks, max.
And many of the audiobooks have been uploaded onto YouTube.