Is there any online database, websites, or google search keywords that can allow the finding of those empty planes template that can be imported into photo editing software to create homebrew livery for planes?
The three I personally use:
Oh wow… Christian, only the middle one still works.
As an aside, I used MS-FlightSim and created a livery so I can snap it at any angle.
Cheers
Things change in 3 years 
They do indeed. 3 years ago I was still in my 50’s. 