For your paladin, De-Priester, I think you might be better off with longswords as your mainstay for weapons.
When you dual-wield with any character, you recieve some form of penalty to your attack rolls. The lowest you can get is -2 to both weapons if you have both the 'Ambidexterity' and 'Two-Weapon Fighting' feats and equip a small weapon (which are only short swords or daggers) in the character's shield hand. Your Icewind Dale II manual will have the penalty charts for that in one of the last 20 pages (I think that's where it is in there). Also, if Rangers are wearing light armor or no armor at all (in other words, leather armor or none), they can equip one-handed weapons in both hands as if they have the 'Ambidexterity' and 'Two-Weapon Fighting'.
Sorcerors, as you may know, have a different stat for casting spells. The other thing with them is also managing what spells to cast as well their stats (enough Charisma for spells, Dexterity for Armor Class bonus, and Intelligence for Skill points, and later improve Constitution for better hit points and Concentration checks). Of course, the same could apply to wizards, though their main casting stat is, as we all know, Int, and so that would give them more points to place in Alchemy, Knowledge: Arcana, Spellcraft, Concentration (important in combat for them, Sorcerors, and Clerics, LET ME TELL YOU!).
Also, don't make too many characters multi-classed in this, as they may not be able to become very powerful in this. The only reason I say this is that you actually have to apply each new level to a character class (just thought I'd remind you of this). In the case of your Illusionist/Rogue, he might go somewhere, but he may not become the greatest rogue or the greatest spellcaster either. Also, he could wear leather armor and cast arcane spells, but he'd recieve a percentage penalty to cast (10% with normal leather armor). Divine spellcasters (Clerics, Druids, Paladins, and Rangers) do not recieve a spell-casting penalty for wearing armor.
Also, rogues can wear studded leather, but recieve a small armor check penalty. In other words, their armor causes their skills to not be performed as well as their skill points in them would allow. Studded leather has an armor check penalty of -1, so it would be best if you stuck with normal leather for a rogue (though I'd advise to not wear armor for a rogue/wizard or rogue/sorceror or bard).
Hope this all helps.  | 
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