Modify, reskin and launch flutter app

I would like some help customizing, reskinning and launching a dating app I bought from Codecanyon. The main issues I would like to address are: 1. Change colour scheme/logo/splash screen (I have these files already) 2. Adding multiple language options 3. Predictive text entry for one of the profile demographic boxes (I have a list of terms in two languages to add) 4. Changing options for user and search demographics to include Male/Female/Transgender/Other (can select multiple for search) 5. Add FB/IG/other social media links to user profile 6. Modifying text and correcting spelling errors 7. Checking security features 8. Setting up Firebase and the admin panel 9. Setting up payments 10. Reporting feature for inappropriate or faulty content 11. Launching app in Apple and Android stores The app is [login to view URL] This link also has documentation to help set it up. Let me know if this interests you, James