Your post doesn't specify if you're talking about DM or PC scholars. I'll approach this from a PC scholar point of view.
I try to avoid melee as much as I can, since I have a low Str and Con. If at all possible, I try to end my round in a square that enemy "brutes" can't reach with a single move, because a warrior with high Str, Power Attack, and a bardiche/greatsword can quite easily force a massive damage save that I have little chance of making.
My melee attacks are feeble, and my spells at low levels are weak in combat. I have therefore opted to use armor and rely on Defensive Blast and War of Souls, at least until I get stronger combat spells. When I stop using my shield, I will switch to a staff. Reach makes it the best weapon for a scholar.
Poisons and alchemical items are great for DM scholars, but as a PC scholar I usually can't rely on them. This is because they take time to make, and are either expensive or found only in dangerous locations. Poisons can also backfire since I don't have the right feats, but I will try to aquire a few globes of demon-fire in case of an emergency.
I personally don't use animal summonings, since they depend on the local fauna, the XP cost is steep in the long run, and they have a tendency to run away when hurt. I don't know the full implications for summoning demons, but it is probably a good idea to limit demon summoning to special occasions.
Curses is sorcery style that has a few weak spells, and many strong spells with difficult prerequisites. I might take it later, but Gelid Bones is the only good spell it has for a typical low level scholar, and even that requires the Oriental style.
I highly recommend Hypnotism, especially with the Scrolls of Skelos. I haven't used it all that much so far, but that will change when I get Dread Serpent and Mass Hypnotic Suggestion.