If you are looking for 'jack heavy armies, look into Khador, they honor and favor their 'jacks, in fact Karchev the Terrible is literally dubbed the man inside the machine! If you want completely pure 'jack armies, play a Mangled Metal game! Mangled Metal means 1 caster, 'jacks, and no infantry allowed. If you play a 15 point game of mangled metal, which is common for my meta, and you play Khador with the caster Vladimir the Dark Prince, just use 4 berserkers as your army. A normal berserker costs 6 points, so you're probably thinking that 4 berserkers is more than 15 points! Well, with Vlad's tier list, if you have I believe 3 or more Berserkers in your army, they all cost 5 points instead of six, so 4 berserkers = 20 points, and Vlad gives you an extra 5 points towards warjacks. 4 Berserkers = 20 points, -5 for Vlad = 15 points. There ya go, a 15 point game with only warjacks!
For question 2, the most common point totals for games around my LGS is 15, 25, or 35, but of course it's up to you and your opponent to decide that!
For question 3, you really have to expect some brutal synergies between the caster/lock and the beast/jacks/infantry. Some lists are just plain nasty, as an example, some spells just work more well with some models than others do. Scan around privateerpressforums(.)com for some professional advice from the pros on lists that work.
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