Hello,
You want a mobile platform based social community app for soccer and fifa fans right ?
Do you have any features list or layout or a general wireframe in mind ?
I cant write much in my proposal as a app development plan since the features you have in mind are not clear, so it might be a good idea if you wish to discuss about your project in more details, that way I can add and suggest some of my own ideas as well.
Some basic things I think we will need are user account management, groups, chat, discussion boards, etc.
Regards