Get an avatar and subscription details to post to server

Hi all,
We’re expert in PHP/Javascript but novice in “Ionic” and “Angular.js”,
wanna make a new sign-up page and start to create ios and android apps.
We couldn’t find a documentation, tutorial or an example.
Page will be a simple form and supposed to do:
1- pick an avatar photo from gallery or instant from camera.
2- get user details with a simple form.
3- post all to the apache server.

But we could not write necessary codes in ionic.
Someone can show me a guide, tutorial or an example?

version: ionic 3
target: android/ios

NOTE: Web service is ready to get $_POST and $_FILES arrays in PHP.
We just lack of experience in Ionic.