In particular, this
bit here. The gist of it:
Plenty of scouts and jump pack equipped assault squads.
Heavy use of deployment by Drop Pod and Thunderhawk.
Use of Dreadnoughts and Heavily Armoured Vehicles rare.
This goes for both the post-Heresy and the pre-Heresy Ravenguard. They probably made slightly less use of jet-packs pre-Heresy than they do in 40K (they were rarer during this period after all) and may have made slightly more use of armoured vehicles, but the gist of their combat focus would have been the same - scouts to gather intelligence, then a rapid strike by highly mobile elements (so assault squads, drop pods, thunderhawks, bikes, speeders, mechanised infantry).