See everyone on gps type app

Hi, I'm really new to android developing, i want to make a very simple app, you open it and you get the other people using the app position, in a range of 50 meters from you. Maybe everyone could update a picture of himself that will be displayed where he is, so like a marker to indicate his position. Then if you click on one of this marker/photos you can see some details that the user put in when he registered. Is it possible for a newbie to do it? I think I obviously will need a server and help. Can you please tell me what sould i do, how much will I spend, etc, and like a to-do list?
thanks in advance.

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