Thanks, Jan, that's really helpful in helping me understand which kind of method to use for casting on, but I'm still confused about what to do with the stitches once they're on the needle. Do I cast on 5 at the end of the previous row and include them in the next knit/purl row, or do I slip them onto the right needle without working them and start knitting from the previous row end? It's very confusing that the pattern says "cast on 5 sts at the beg of next 10 rows" as it feels more instinctive to cast them on at the end of the previous row and then work them on the next row. Is there a difference?
Sorry if this is a bit vague, but then so is the pattern! I feel I must be missing something obvious in all this. It would be very like me - for ages I didn't realise that when you pick up stitches down the side of a garment you're meant to pick up and knit, so I'm probably making another basic error here too!