I want App Installs for my Android App

I am looking to increase the installation rate of my Android app by launching an advertising campaign. I have decided to focus on Google Ads as the primary Ad Platform, with an initial budget of $500. I understand the importance of creating high quality visuals and engaging copy for effective ad campaigns, so I have decided to go with basic text and images to keep my costs low. I plan to utilize my budget in various countries, but I am not yet sure which ones to focus on. This will largely be dependent on the initial trends and performance data of my ad campaigns.