Bulk Mobile App Marketing

Hey Freelancers, We are looking for people who can help us advertise our mobile app to quality users on the iOS. We are looking for 2,000 to 20,000 users to "test" our app and let us know how they like it / rate it / review it, etc. Top 5 countries preferred - US, CA, UK, AUS, CH. We want it done in quick amount of time not months either. Please let me if you can help us out with this task and we will chat about more terms and details :) Philip