So I have outline for story line of main girl paths. That is not the whole story however. It is only what is happening between girls and mc. There is a central plotline that will move story forward. Next week I'll be doing that. After this I'm going to start writing dialogs. Main problems I have now is:

Find right software for this. MS Word is good for writing linear text but with the kind of branching I have in my head I need something that will help me easily navigate between scenes and branches, and visualize a timeline. 

Also I need to find someone who will read dialogs and check if their are correct and realistic. English is not my first language, so I need to make sure that my characters speak realistically.

Lastly I need to find a couple of girls who will help me with girl perspective. How girl will react in different situation? What are her thoughts? Everything from the way she speaks to what outfit she selects needs to be "girl-checked".