http://www.dakkadakka.com/wiki/en/Warmachine_Factions_at_a_Glance#Cryx
That original article isn't great, but it's what I came up
with when we started.
You're likely to see 1 Warcaster, a scrap thrall, multiple
bonejacks, and infantry. Helljacks aren't great, so they
are often fielded for specific roles, or people just go large
and put in the Deathjack.
Cryxian armies tend to have fast elements, debuffs, and
mindless units.
Cryx will field more models numbers wise, due to
investing fewer points in helljacks.
Also, a lot of what you field will be based on warcasters.
The battlebox gives you a basic caster and warjacks.
Denegra is supposed to be very good as a warcaster,
but you'll tend to play her in the backfield casting spells
through her arc nodes. Where you go from there will
depend on how you want to expand.
PS Warmachine armies tend to have more infantry than
warjacks, whereas Hordes armies tend to include more
warbeasts than infantry.