Complicated band and lapel

what do they mean when they say to cast on 5 its at beg of next and fall 10 alt rows, and 65 its at beg of foll alt row? Am I supposed to be casting on at both ends? This is a right lapel and band and then there is the opposite instructions for the left side. Seems like the pieces will make a shawl in the front, but how will they meet properly in the back?

Welcome to KH!
You’re to cast on every other row so that’s always at the beginning of either the right side or the wrong side row but not both. If you call the next row, row 1, cast on 5sts at the beginning of rows 1,3,5,7,9,11,13,15,17,19 and 21 and then 65sts at the beg of row 23.
What is the name of the pattern?

The pattern is from Little Littlewoods called Chunky 3103. Thank you so much for that clarification. I could not figure out why I would be having an uneven border on both ends of a collar.