What is the most effective way to paint projects?

I am working on a project, and am almost done with it. I, however, need to paint intricate designs on it. I will buy whatever paints, tools, etc. that I need. I have the project made in part metal, part plastic. I have a printer, some spray paints, and a decent amount of art knowledge. I kind of want to copy designs off the internet. How do I do this without free-handing?
 
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