One into Mastery, one into AmpDamage, one into Mages, twenty into Skeletons
(this should put you at the end of Act 2). Then go back and max out Mastery,
buy a few more curses, and whatever other toys you want.

Strength points are usually defined by your armor (84 for Trangs armor,  106
for the helm). Dexterity, none. Energy, enough to get most of your skeletons
started. Vitality, everything else. Ignore blocking, you shouldn't be
getting hit anyway. You're the general managing the battle from behind your
skeletons, not a front line grunt, so resists and fast run/walk are your
defenses.

And if you're going to run around with Leoric, don't get hit by melee
monsters: the Bone Prison traps you and the monster together, and then you
die.
--
Zamboni

  put three points in skeletons first, then start pumping mastery as
fast as possible.  Even though skeletons have been boosted a bunch, they
still die pretty quick vs. bosses.  Unless you have a friend to help you
with bosses, be ready for a rough fight.  After SM is at a decent level
that you can handle a boss then go for more skellies and/or mages.
  Just in case of trouble, I like to have one point in clay golem and
one in iron maiden.  With that setup you can kill any boss eventually,
but you'll burn through a lot of mana and stamina pots.  (:
  Early on, and perhaps even later, stick sapphires of whatever quality
in your armor or helm so you have lots of mana.  You don't need mana
regen so much as a skellymancer, so you can spend points on vit instead
of energy.
  Later on make sure to have at least one point in attract--it'll make
your skelly army last a LOT longer in tough fights.  It's also a pretty
good way to get that first corpse.
  Prayer mercs are good.  As is a blessed aim merc when used with life
tap.  Personally, my skellymancer is going for a few skellies, and maxed
mages with high curses.  I'll probably go with a prayer merc since mages
don't benefit from life tap.