the dice rolls of this quest will follow a traditional crusader king style with intrigue, martial, stewardship, diplomacy, personal options, and then research/learning.
the dice rolling system will apply to both building your settlement/base and during combat turns, this will follow a system that looks like the one mad0slayer uses in his dwarf quests and a little bit of the system used in the quest, "colonizing a peaceful planet".
martial: is used for military matters and during war turns and such, martial is used to build military infrastructure, recruit troops to refill your regiments when they take casualties, heal the wounded, military infrastructure primarily consist of outposts, fortifications, buildings for housing your regiments and their vehicles and other stuff.
stewardship: you should know what this is, it dictates your building and other similar manners, stewardship is used to build infrastructure for civilians and workers, food and mining buildings, energy buildings and more.
intrigue: is used in stealth actions and spying, this is including secret raids by your regiments (if they can), making sure heretics and genestealers don't take root, keeping tabs on the populace and your regiments to learn where dissenters are and what do they think of your command and what they want and such.
diplomacy: this is used to keep peace among your regiments, making contact with the populace of a world if there are inhabitants, assuming their humans (or abhumans) of course.
research/learning: this is used to study tactics, learn more of the regiments that are from different worlds that are under your command and see if you can convince a tech-priest to maybe find a way to make hotshot las packs more readily available.
personal actions: if you been on quest before, you should know how this works, this often ties in with learning and is used to buff the chance of buildings being completed or lowering the chance that something will go horribly wrong if you roll badly.
the dice will be 1d100 and the more dice you roll for an action, if its completed but there's numbers left over, those numbers will be used to contribute to the next upgrade of that building or the expansion of similar buildings, or even out right finish the next upgrade immediately if you roll well enough.