i just got the chaos codex and battle force wat should i get next can anybody plz helpme

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Bezerkers favourite unit in warhammer 40k and lotr
Black legion-1500+
Isengard-800

Firstly, you'll want a Daemon Prince, theyre a must in any army. You'll also want more Rhinos, Plague Marines, A Defiler and some Obliterators. I'd also say get Berzerkers, because I have a soft spot in my heart for them. And those Possessed you got in the battleforce? Chuck them, or use them for cool conversions. do NOT build them. Possessed=Garbage.

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Warmachine/Hordes
Khador: 69 points, 4 casters
Trollbloods: 49 points, 3 casters
Minions: 1 pt (For Trollbloods)

Warhammer 40k *Indefinite Hiatus*
Dark Angels: About 4,000 points

*Needs re-worked points estimate

Well don't be too hasty with the possessed they are fun models to have in a fun game. You're assuming he/she is playing competitively?

I good place to start is Rhinos, Berserkers, Plague marines, a daemon prince, some oblits and some regular tactical chaos space marines can be useful, if you still have some money spare a squad of terminators wouldn't be a bad idea!