help a warhammer fantasy noob

I play chaos warriors. I want to go with a magic and partial range (hell cannon) buffed with uber combat (warriors). I was thinkin 2000 points of Khorne and Tzeentch. My list so far : 15-man warrior squads x3
5-man squads of knights x2
10-man squad of chosen
Hell cannon
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Really Looking for good magic. This list is simple right now. Any suggestions

buff up your units of warriors and chossen t atleast 18 6 wide 3 back. this will help you with combat ress

take out chosen and make the warriors with 20 guys in each