what if i was drawing information from people:

я спрашиваю эксперта = im asking an expert. which case is used here? accusative or genitive?
я спрашиваю вcе or вcеx = im asking everyone. do i use вcе or вcеx?

also, what if i was asking for a thing?
я спрашиваю совета = i am asking for advice. i believe this is in genitive case.

the usage of accusative and genitive cases here are rather confusing.