With Khorne, aggression is good. Your Lords have a meter that goes up when you fight and down when you don't. Also, the quickest way to get money is to win battles. I've found exalted bloodletters to be incredibly good in melee, but early game, normal ones are still decent. You'll want to get some anti large units up (halberd chaos warriors) if you end up facing down human units as you'll face a fair amount of cavalry. For other chaos factions, generally a mix of melee charges and cavalry launched into their rears will do the job as they are very weak to intense leadership drops.
As posted above, rapid expansion along with growth in an early province to get you the advanced units you need will yield good benefits. Once you have a good base province, you might consider just dumping garrison buildings and economy buildings into provinces to save you having to babysit them so much (especially once the rifts start spitting out hordes). As you grow you will obvs want to have recruitment buildings dotted around so you can top up your armies or build additional ones.
As posted above, rapid expansion along with growth in an early province to get you the advanced units you need will yield good benefits. Once you have a good base province, you might consider just dumping garrison buildings and economy buildings into provinces to save you having to babysit them so much (especially once the rifts start spitting out hordes). As you grow you will obvs want to have recruitment buildings dotted around so you can top up your armies or build additional ones.