How do I flirt with men if I'm shy?

Any subtle hints I could give them would be nice
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Also, I never really make the first move and when guys have in the past, I have confused their egos for confidence. I have been told by my mom and my male friend that a lot of times the genuine guy that likes me is too scared to make a move and doesn't, and the guys who want me for my body will a lot of times be the guy to make the move
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Because of that, I want to be able to make the first move but I don't know how without completely putting myself out there.
How do I flirt with men if I'm shy?
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