Implicit in your question is the idea that the corporation can be active immediately or in short order. Is the corp supposed to start with some/all of the Incorporate fee? That would be enough to get off the ground. For my prestige, though, it starts with $0. (ie the Incorporate cost was all licensing fees and red tape)
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That would be great! A simultaneous layer that interacts with the main might make climbing the prestige system and REP later again easier and different enough to feel engaging.
But no, I incorporated with zero dollars. I've dumped seven prestige bonuses into Corpo and done some REP/Mission free money making dives, caching 10k at a time until I could afford an office, warehouse, sales staff member, two production machines, and a pair of line workers. So I think I'm around the intended start point now!