You need to have a Google developer account, which requires one-time payment of $25, to publish your Unity game on Google Play. To prepare your game for publishing, you must adjust its orientation to landscape only and switch to the Android platform from the default "PC, Mac & Linux Standalone" setting. You also need to set up player settings such as company name, product name, icon, and publishing settings like keystore management and API level targeting. After building your application bundle, you can upload it to the Google Play Console for internal testing and eventually publish it to the store after review. During setup, you'll need to complete tasks on the dashboard page and may be notified of any issues that require fixing before submission.