You can find a good cleric guide
here (56k warning).
You can find SP calculators
here and
here.
There's also a well-detailed list on the Warlock and Cleric skills
here and
here.
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From what I've seen, there's virtually no bad skills from either class, so you could farm them all. You should also get a level 1 Shield Trash from the 1h Warrior's skill, but you'll have to keep either Warlock or Cleric 10 levels behind.
If you want a solo build only, you can skip the group heals, party buffs, and non-self buff skills, as well as the pointless warlock debuffs (e.g., physical raze/ravage).
