There's no special rules for them and any warband can include any mix of units. Just choose or make-up a colour scheme you like.
If you have a particular predilection for Thousand Sons, Berzekers, Plague Marines or Emp's Kiddies, then you might chose to do one of those and theme your army around a particular Chaos god. Otherwise just base your choice on what you think is within your skill level to pull off and looks good. Iron Warriors are popular because all you need to do is basecoat them with Boltgun Metal Spray, black line, and fill in a couple details.
Along with armies such as the thousand sons, death gaurd etc. - You can choose a chapter that dosnt have speacial units but used to have speacial abilities in the old Codex and you can use their color scheme
I'm in love with my Word Bearers, nothing speacial about them, but as their preference they tend to have more troops selections and like to use daemons as meatshields
With forces like Word Bearers, Iron Warriors, etc. you can prolly find some backed-up fluff
Personally my Favourite is the Night Lords - nut cases with a big addiction to terror. Cool color scheme of red, blue and gold. Fluff wise they are a very fast and mobile force. Heres a link to their IA. That site also has other IA if you want to have a look around
death guard marginally good at killing lol, i dissagree from hands down experiance... ive out combatted many armies since my start of death guard on the day of the typhus model released during eye of terror..
i play more troops than ive seen with other death guard armies though, 3 squads 5 termies 1 drednaught 1 squad of possesed sometimes like to take my hords of zombies to and the typhus himself
theres the choices of the 4 cults which imo are the best
(nurgle, tzeentch, slaanesh and khorne)
tzeentch seem to me more of firepower army..
khorne seem to be a full on close combat army..
nurgle for me is a mix of both but these are really tough..
and slaanesh im not to sure bout but they have some good rules modles e.t.c plus lucious the eternal is really good
then theres the traitor legions,
knightlords, black legion, iron warriors, blah blah blah....
if i were you id read up about them see which one you feel like readiong more.. then look through the models and as a painter and a gamer which one appeals to you most.. then it goes from there
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