64 sts is how many stitches you should have at the end of the row.
p8 is just purl 8 stitches
p2tog is purl two together (a decrease)
skpo means slip 1, k1, pass slipped stitch over. You are passing the slipped stitch over the knit stitch. Your pattern should say what it means somewhere.
Thank you so much for your help! The instructions aren’t very helpful (I’m not sure I have a beginners book!).
Thank you again -