For this I would go with 8(10,12) and work decr round until 10sts remain. For the original question, a common toe shaping is to have the decreases at the end of N1 and beginning of N3 mirrored on either side of N2:
N1 (sole) k to the last 2, K2 tog (this is clear) N2 (instep) K2 tog, place marker, k to last 2 st. k2 together. N3 k2tog knit to the end of the needle. You could use a combination of k2tog and ssk for these decreases to make a prettier line up the toe shaping if you want.
See what the directions have to say about the marker and perhapes something else that's going on there. I couldn't find a picture online.