I want to complete all quest and get all possible xp in game.
I need:
1)bard
2)dreadmaster of bane
3)paladin/cleric of ilamater
4)transmuter
5)monk
6)sorcerer

I don't need special lines, just xp, with no cheating, no mods

I was thinking:
1)bard
2)monk - do I need monk, is there monk related quest?
3)paladin of ilmater/sorcerer - how many levels of paladin do I need for holy avenger?
4)rogue/transmuter
5)barbarian/fighter/dreadmaster of bane
6)druid

Barbarian should be neutral evil - just tested it...

You don't need a paladin level to do the holy avenger quest, only for getting the attribute reward. One single paladin level is enough.
I don't remember any extra XP you get for having a monk in the party.

I haven't found anything about monk, either....

If it's your first time playing the game I recommend focusing more on what spells your characters can get than on the little unimportant extra XP you might get from hidden bonuses.

IWD2 has a scaling experience system, so if you do manage to become over-leveled you just earn less XP. So it's not really possible to get ahead, if that's what you're trying to do. The only way to actually get ahead in terms of level is to run with a smaller party. I did IWD2 with a 4-man party (Fighter/Barbarian, Cleric, Wizard, and Paladin/Sorcerer) and found it worked quite well, giving me that slightly added feeling of power.

With regards to your party, I'm not aware of any Monk-specific quests, although there is one challenge in the game that is obviously geared towards the monk. The Monk and Sorcerer stand out from the other classes because they aren't dependent on loot drops to be effective (wizards need scrolls, warriors need weapons and armor) and the Icewind Dale series is notorious for stingy loot drops.

For Paladin/Sorcerer, one level of Paladin is all that's necessary or desirable. You gain pretty much nothing from more levels of Paladin, since at high levels all of its class features except divine grace go obsolete anyways.

For the Rogue/Wizard, I'd suggest just sticking single-class Wizard. You can still invest in thievery skills as cross-class skills. I did this in my playthrough, and was able to unlock every lock and disarm every trap. I don't think the level of Rogue is necessary at all.

Or, alternatively, keep your characters underleveled on purpose; only level up characters when you actually need to. (This strategy has been called "level squatting".)

In fact, due to the way the XP system works, you only need to keep one character underleveled to give everyone else more XP. A 5-character party where one of the characters stays at level 1 (just keep them away from combat) will get more XP than a 4-character party where everyone is at an appropriate level.

Note that following this advice will likely cause your party to be higher level then expected, which may make the game too easy.

(The XP system really is poorly designed in this game; it wasn't quite as bad in D&D 3.0 because you couldn't gain more than one level at once (excess XP would be lost), but that particular rule is not implemented in IWD2.)