What I do is, since you start with a weapon that does 1 into summon skele, first point i get goes into amp.
1 into skele
skele mastery till you can get clay golem. (so they live longer ... saves on mana and casting)
1 into clay golem
max out mastery
then max out the skeles mastery
1 into golem mastery
max out summon resist
1 into revive
When needed, or I get free skill points from quest, I add to the needed curses.
IMO, skele mastery is more important then massing skeles right away. IMO why have mass skeles that have low life and damage, to where you can have 1 that is almost as good as your life and damage.