Best way to paint black outlines

[Monte_55]

I am getting ready to paint the white trim on my freshly painted (5 days ago) Red airplane. I want to outline the white trim with black like most Pitts I see.
Do I go ahead and paint white then mask off the black outline are is there another way?. I have been searching for hours on painting sites trying to figure it out to no avail.

 

[RickRice]

 

[kjkimball]

 

[cwilliamrose]

 

[taff]

 

[Monte_55]