You will need maxed Skeleton Mastery. If you intend supporting your troops with curses, you don't need Bone Armor. Probably the most useful curses are Iron Maiden, Dim Vision, Lower Resist. If you intend to carry on in melee alongside your troops Bone Armor is useful, and you will need to pump DEX if you want to hit anything. Alternatively you can use one or more of the direct damage skills (CE, Bone Spear, Bone Spirit).
Links:
Sirian's Skeletorr (skeletons and curses):
http://sirian.warpcore.org/diablo2/skeletorr.html
My Boney Jack (skeletons and melee/bone spear):
http://www.geocities.com/jaffa_tamarin/diablo2/boney_jack.html
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Jaffa
http://www.geocities.com/jaffa_tamarin/diablo2