Update and fix my Android app

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Update and fix my Android app
I would like a quote on the estimated cost and time to fix my app.
I have an Android app similar to Letgo and Offerup that allows users to buy and sell merchandise with buyers able to negotiate with sellers within the app.
Most of the app is completed but need fix somethings and change other things.
There is something wrong with registration and login. Both is not working. This alone makes the app unusable.
One change I would like done is on the home screen if there is no merchandise for sale within the selected area. I would like to add an image along with the no merchandise message and login and registration buttons.
Another changes is on search.
On the search range. I would like to the user be able to only search within the users country when searching any distance.
When a buyer views a merchandise. I would like to add other sellers products for sale and similar items for sale ( this works but can work better).
I would like to change the in-app purchases.
$1 to add 4-10 images.
$3 to add a 30 seconds video for sale items.
$5 to add 11-50 images.
$5 to be a featured listing.
There might be other things I want to change once login is working.
Skills:
Android
, Mobile App Development
, PHP
, JavaScript
, MySQL

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