I am a tester. We use one tool which contains pages developed using Flash. I need to automate few tasks which are repetitive for our testing purpose. I have knowledge on Seleniu
I've played with Flash Selenium before.
It also depends on your project but here are some links to get you started doing some research.
Directly from source: http://www.adobe.com/devnet/flash/articles/flash_selenium.html
http://toolsqa.com/selenium-webdriver/testing-flash-selenium-flash-javascript-communication/
http://automationmentor.blogspot.com/2014/08/automating-flash-applications-and.html