How To Become a Professional Drone Pilot
Get Trained and Pass The License Test
If you're interested in getting a job as a drone pilot, or even making money as a uav drone pilot, then it is essential to get trained, and get a FAA license. Even if you upload your drone video to youtube and make adsense revenue, that counts as making money with your drone, and you would need a license for that too.
Here's a great video to watch to start -
How to Get Your FAA Part 107 Commercial Drone Pilot Certification
This guys essentially recommends getting your training from https://remotepilot101.com, which helps drone pilots pass the FAA Part 107 UAS knowledge test. The cost of that course is $149 (normally $299.99) and you get a certificate. Then you would need to take the test to get your license.
Now, the next logical question is where do I take the faa part 107 test? The Federal Aviation Agency has a page on its site for this, here.
A list of knowledge centers are here via the FAA website pdf:
Then you've got to register for the FAA drone pilot certification, here.
It doesn't look like you need to take the training from a third-party, but it seems to be helpful. Please comment to correct or add to this.