When I help my tutors I usually tell them to get to 5kcs and then save. I'll volley with them until 10kcs. Then save again. And I let them fill 14 dorms with t3. From there it all just depends.
As mentioned its 2,665,056,500 to buy all 32 dorms. T3 bc is 4,160,000,000 T4 bc is 118,400,000,000 T5bc is 1,488,000,000,000 To purchase crew.