I wonder if you could clarify something.
1. I cant cast with the Insectoid Alchemist, do I have to wait to find a staff?
2. "Bear Form" is not selectable. So what should I select in the beginning here?
3. Explain Alchemy on the Rogue please.
4. With this setup I didnt get an alchemy pot in the start, but you might find something later.
So basically things might work out and im retarded :D, but I feel I really need to know nr.2 before I go further.
1. Yes you have to find a staff/wand. You'll get one very early though, so it's not much of a problem
2. The skills I mentioned weren't really "starting" skills, just things the character use. If you want starting skills, I'd do HeavyWeapons/Accuracy, LightWeapons/Accuracy, LightWeapons/Accuracy, FireMagic/Concentration. Make sure to take the 2nd point of accuracy on the rogue at level 2 so he can attack form the back row. The Bear Form refers to a potion you get a bit farther into the game that lets you transform into a bear. I like this on casters since later on spells start to fall off a bit and since they have very high energy the bear form transformation lasts for a long time. You can craft the potion with FalconSkyre + Mudwort.
3. Alchemy is on the rogue since he has the least amount of other skills that he needs to level. Unlike the front liners he doesn't need an armor skill or concentration, so he can spare the points on alchemy. The alchemist isn't getting it since he needs 3 in lightweapons and 2 in accuracy to attack while in bear form. The Alchemist class bonus (duplicating herbs) works whether or not you have points in the actual alchemy skill or not. Just be sure to keep 1 of each herb in the alchemists inventory to allow them to duplicate, then the rest can go to the rogue.
4. Yes, you will find the alchemy mortar in the second map.
You'll only reach around level 13-15 in the end, so skills points aren't exactly plentiful. I'd prob spend them as so:
Battle Mage: 5 Heavy Weapons, 5 Critical (Scythe DMG), 3 Concentration (Best Staff Req), 3 Accuracy
Barbarian: 5 Light Weapons, 5 Armor, 5 Critical (Backstab), 1 Accuracy (Tome of Wisdom bonus here)
Rogue: 5 Light Weapons (Or Missile if you want), 5 Critical (Backstab), 4 Alchemy (Don't need 5, it's only bombs, wait until you have decent amount of crystal flowers), 2 Accuracy
Alchemist: 5 Fire Magic (Or 4 fire 1 Air if you want fireball), 5 Concentration, 3 Light Weapons (For Bear Form Dual-Wield), 3 Accuracy
The Battle Mage doesn't actually need the Armor skill, it only gives 20% bonus per armor piece so it's not really worth the skill investment here since you already have tons of armor from class/traits/spells. Equip him with Crystal Armor+Nergal Amulet and your Barbarian with the Meteor Armor and they will both end up with around the same HP and Armor as one another.
As far as what order to level the skills on: For melee focus weapon skills first, accuracy if you find you're missing too often, armor once you have a decent set of it, and alchemy/crit if none of the others are needed. For your alchemist max fire and a few point into concentration at first, then skill up the others when you want to start using bear form.