Shingai, you still need an attorney that represents the corporation and not the founders. What you draw up may not be legally binding if you don't do this correctly.
The attorney MUST notify each party that the attorney represents the corporation and not them individually. You must be represented by outside counsel or wave that right. It is KEY that the corporate attorney notify you as such.
This is one of the fist "ah ha" moments of shock an entrepreneur has when the attorney(s) explain to him/her that they represent the company and not him/her.
If your attorney hasn't done this, you probably need to find another.