IPO - When to do it?

Hello,

I'm currently running a profitable company eager to expand (Inca Airlines in Idlewind). Of course, an Initial Public Offering of Stock in the company would be one way to go through with this expansion. However, to determine when I will do this public offering, some questions:

- is the maximum amount of money to be raised through an IPO based on the Equity in Stock (always 10M before the IPO), or is it based on your company value (which is 10M + own assets)

- Based on this, if I wait a bit with the IPO, untill my own assets (through acumulation of profits) are higher, will there be a higher return, or doesn't that change anything?