Need help with defining the Timelines/ Milestones for my Project

Hi Rodinhooders!!

Glad to be a part of this wonderful & enterprising community. Working with 2 start up companies in 4.5 years of my career, I am now moving ahead to start a venture of my own, GreynGreen.  

GreynGreen is basically is a website that helps any individual user to plan & budget their finances for daily activities/ special occasions. A personal tool that keeps a record of a user’s planning and budgeting tasks, accessible at any time.

I am looking for suggestions to help me define the timelines/ milestones I need to achieve to move ahead.

Also, if someone could throw light on how to decide how much equity (shares) to give a new partner?               

I look forward to all your suggestions/ criticisms/ ideas & thoughts about GreynGreen that would definitely help me make this venture a huge success..