Developer to add features/functionality to 2D Unity Game

I'm looking for developer support to add features to a game I've been working on in Unity. It's a 2D trivia app based on a purchased template. The game itself is running – I’ve tested it on an Android device and it runs as a functioning prototype. Now the prototype is running I need to add some new functionality to the game. 1. Add Imperial/Metric Toggle on Main Menu The game is based around guessing the size of different objects. In terms of the internal question logic, this would require each item in the QueryList object to have two sets of data, and depending on whether the player chooses metric or imperial on the main menu the ingame questions are presented in either centimeters or feet / inches. 2. Add Google Play functionality I would like to add Leaderboards and Achievements to the game. The template itself was made in 2017, so a lot of the Play Store scripts may need looking at. I would like to add achievements when the player guesses 5, 10, 20, 30, 40, 50 and 100 questions correctly. 3. Add Purchasable Content Packs I would like to set up the app to include the template for purchasable content packs. Each content pack would run as its own instance of the game. 4. Set up Ad Networks/Video Ads I would like video ads to play: • When a player gets a question wrong • If a player wants to keep playing and not lose their current score on the Game Over screen • When a player answers 10/20/30/40/50/60/etc. questions 5. Add social sharing button When players reach the Game Over screen, add a button to allow them to share their score across social networks. Let me know how long you think it will take to add this functionality (including documentation so I know how to make changes/add content/etc.) and how much you would charge for it. Looking forward to working with you! Phil