Just leave, badies are so weak at the start that only near then end of act 1 will you struggle if you are underly leveled.
A recomended build is max skeltons, max mages, max mastry, 1 point in res, and 1 point in revives.
One point in all curses might be useful otherwise only get up to decrepify and cast amp damage whenever you are not restoring your army.
You are after a lot of +skills, atleast 20 or more. Also an insight merc weapon would reduce the energy you need to summon constantly. Do not bother with dex and only get enough str to equip caster gear. If you have excess mana, concider getting more points in revive as long as you are hitting the revive limate.
You are after the odd point of energy but mostly vitality. Use your summons to tank most hits so do not care much about res.
Bosses may be a bit of trouble, never had to solo them so you might need to find your own stratergies for them.
I can assure you thou that the summon necro can kill hell baal, although slowly.