You'll want at least one point in Rush Attack and Whirlwind, but after that wait until you have points to spare. One level of Evade is also essential, but the return on investment after that is poor. In D2:ED I got Bleed up to level 10 (after that the effect per skill point dropped; that may or may not still be the case in DKS), and of course maxed my weapon expertise of choice.
Level 1 of the healing spell comes in handy, after you hit level 15 and can learn it. At that point you may want to learn Mana Efficiency, which reduces the cost to summon your creature. I didn't use a lot of warrior skills (like Thousand Strikes or Fatality), but mid game learning Mana Efficiency allowed me to summon my creature and have enough mana left over to heal if required (I only put a couple stat points into Spirit).
Some people like the ghost summon early in the game for its ability to heal you (though not on demand), but I never tried it.
A point in Life Leech and Mana Leech should help; some people like more in either or both. I put a couple points into Regenerate when I was able, which helped, but after unlearning all my skills (possible once you get the battle tower, for a price), I didn't bother re-learning it.
In D2:ED I maxed Lockpick as soon as I could, so I could get all the chests I found when exploring. In DKS I did this as well, but the loot on low levels seems to be mostly just gold and potions, so playing again I think I would delay learning higher levels of Lockpick and make a note of where there are chests I need to come back for later.
