Unfortunately, I guess Rhion is right. At least in the army book Khaine is not really favour of magic which is suppossedly tainted by Slaan if I remember correctly. However, all Druchii life and die at Malekith's mercy, so any sorceress can be included in any army. You might want to reflect that in your army by not allowing any of your sorceress to join any unit in your army as the devotees of Khaine dispise the magic users.
As for what to start with, I guess the best advise is to just browse some of the army lists posted here on the forum. From a personal position I would include the following units:
1. At least one unit of 5 Bloodfiends, better even 2 units, equip them with RXB and you have a good flanking and harrassing force.
2. As you obviously do not want to include corsairs, one big unit of Bloodguard (I use the same name for my city guard regiment with my highborn in it
), 20 strong with full command and shields. In case you feel like adding some more shooting a unit of 10 Bloodguards with RXB and shields is also a reliable choice.
3. Blood Reapers, definite choice, 2 at least.
4. For true fluff you need to include at least one unit of witch elves, 20 strong. Perhaps even think about two units or making it the biggest unit in your army to reflect the Khaine aspect.
5. For any other of the units (Execs, COK, COC) this boils down to your personal choice of playing. COK is the charging unit, put a noble or highborn in them and you even get them quite reliable on stupidity. COC is a nasty flank charging thing. Combine the COK and COC (both causing fear) and you have a good chance for an autobreak in CR.
I personally do not like Execs as I think they do not have enough surviving capability with light armour.
6. If you are a real devotee of Khaine you should think about including the Cauldron of Blood. That is mainly for fluff reasons but, hey, that is what your army is based on anyway...