Social Media Map App

Dear Internet,

it may sound a little bit strange, but I need help, a lot of help!
I don't know anything about coding an Android app or something like that, but I have to make an app for personal use, just to know how creating an app looks like.
My app looks like this:

The app that I want to create is an Social Media network for everyone around the world. It is used for people with accounts on a worldwide map. The account contains, or course, your description. But instead of daily life selfies or photo's, this app is used for Geography where photo's/video's from around the world are shown on someone's account. These photo's are pinned on a worldwide map, which will be in the main app.

* Summary *
The accounts are pinned on a worldwide map, which will be shown every time you'll log in. The accounts can also be searched in a search bar. Someone's account contains a pin section with all the photo's he/she made, shown on a world map (again but without the account pins).

It is a really small app, but many people could use it.

Again this app is only used for geographical photo's and video's, where people can give their stories on.

I really want to build this app, but I don't know where to start...

Greetings,
Papyrends

I don't know if this can be helpful for you, but we wrote an article about what a social app must have. Just in case you want to add or modify features of your social app.

Great thread for new social media map developers.