App Iphone

I would like to create a thematic app for specific kind of people and places (more details after), where: - users can mark on the map where user found a specific place and can insert a photo, a description, category. - users can find places according to their current position (near tot km) and vote with stars (1>5) , comment places and can tag themselves in these places (also in facebook/twitter). I need the possibilities in the future of seeing all also in a website. Who create this app should be available after when I have published the app in the appstore to maintain relations for measures and for possible updates.