Custom Project-mobile app

This is the requirement in details for phase-1. pls see the prototype attached in pictures first to start. Front end the features should be---- login with FB and twitter -> select place,sports,time and find players -> select a player and hit play. FB login permissions are only basic-like email and profile pic and allow to post on user behalf. you can also create a new game and invite facebook friends (FB events api) or gmail contacts. search should show the closest match in terms of date. If no body available then it should ask you to create a new game and invite friends. The friends button is to add a friend from our DB and follow him. Notifications will show any new message or confirmation of any event. The history will keep track of your bookings. Initially place will be your own place by default. But user can follow that player and chat with him for place in the friends section. Back end Admin can allow a particular sports for a particular city. Also the as usual features of any website like add people, track the app etc. This is phase-1 as we are testing our market. Phase-2 will add some advanced features, for e.g; first book a movie ticket and then add a taxi service and redeem coupon etc. HTML5 and jOquey app with back end PHP. preferences of framework are:- phonegap, Appcelerator Titanium, jQuery touch Time is not a big constraint compare to the budget. Give me your inputs on it. Before going to more details I need a upfront approximate estimation of budget for phase-1 from your side.