Build App By Codecanyon

I have purchased an app from code canyon and need this app built and set up this is the app https://codecanyon.net/item/nerd-vpn-flutter-vpn-android-full-application-with-iap-integrated-with-backend-and-admin-panel/28722345 I have created the logo for the app and have a server and all parts ready i just need someone to redo font, theme and colour set the app up and have documentation on what i can edit if needed to in the future