No and no.

Yes.

Yes.

Only if the spawn is killed.

No, the 'spawn' chaos gift can be used on any figure in the chaos army, whether it be a character, monster, daemon, or rank and file trooper.

No, chaos gifts can be used on any figure except daemons and chaos spawns.

No.

A Khorne unit is lead by a champion of Khorne, a Nurgle unit is lead by a champion of Nurgle, a Slaanesh unit is lead by a champion of Slaneesh, a Tzeentch unit is lead by a champion of Tzeentch. The rank and file troopers for these units can be beastmen, minotaurs, chaos warriors, centaurs, dragon ogres, etc.

A champion is considered to be any of the characters from that patron deity (champion, hero, sorcerer, general, battle standard bearer, etc.).

This means that minotaur units led by champions of Khorne can use Khorne only magic banners.

No. That only applies to daemons. There is no check to see if Khorne Chaos Warriors will attack Slaneesh Beastmen.

No.

The special abilities are in addition to the abilities of an ordinary troll.

The values in the Beastiary section in the Chaos Army book are the correct ones.

The correct leadership value for a harpy is 6.

The Centaurs can have bows.

Yes and No.

The beastmen only have to take the in-fighting test if they are making a normal move, or a march move.

There are no more chaos thugs.

Mount is removed.

Mount is removed.

Mount is removed, its turned into spawn with the character.

Same as the character, ignore the mounts attacks and wounds.

Yes.

You must field a champion from a particular deity in order to field a unit of daemons from that particular deity. The champion can be any chaos character. This means that to take a Bloodthirster of Khorne, I need a champion, hero, general, or battle standard bearer of Khorne.

Yes. First of all the daemonic save is modified by the strength of the attack, also, wounds from a unicorn or magic weapon in hand to hand do not get a daemonic save. Wounds from magic missile attacks still get a daemonic save (with appropriate strength modifier).

Chaos gifts can be discarded to allow a re-roll of a missed daemonic saves.

Technically, the bearer of the Sword of Destruction can have no other magic items, this prevents Khornate Champions from using it. A house rule is suggested that allows them to use it and the magical properties of the chaos armour are negated and it is treated as heavy armour.

He only gets the 2 listed.

D3 wounds once the creature is wounded.

D3 wounds once the creature is wounded.

If the Bloodletter is killed the Juggernaut must take a Monster Reaction roll.

Yes and No. Note that Daemonettes riding steeds of Slaanesh have a 4+ daemonic save, and a 6+ armour save.

Yes. The driven off rule applies in this case (the Slaanesh character is only immune to break tests).

No.

Mounting Daemonettes on Steeds of Slaanesh costs 25 points.

Yes.

Yes.

The Blue Horrors can strike, as long as the Pink Horror had not already done so earlier in the phase.

No.

Yes.

No.