Startup with three founders

For point number 1. you can sign co founder agreement which define your role, responsibility and other factors like shareholding for initial stage.
for point no. 2 you need to register your company as Pvt ltd for no later stage when investor like to take exit through or as mutually decided . 99% investor invest in any company in exchange of equity to get funding you have to have company and split the pie among co founders and investors.

if need any more clarification please write us or ipforstartup@icloud.com hola@ipforstartup.com

Hey,

This is the first answer I've offered to a question on this site. Here is a very useful site I refer to http://www.startuplawyer.com. There are a lot of variables to consider. What you need is a comprehensive online resource that will KEEP YOU AS FAR AWAY FROM LAWYERS AND CONSULTANTS AS HUMANLY POSSIBLE until you have a firm handle on the questions you should be asking. You FIRST need a 10-40,000 foot perspective on this whole IP/Start Up/Entity Formation/Funding process. And the structure/user interface/information architecture of that site is just about as good as you're going to get (anywhere).