How do I show someone in a mature way, that I care and like them? How do I communicate my wants, needs, and feelings to someone effectively?

There's this guy that I like and it's my first time liking someone and being open about it. I do have crushes before but i haven't really tried making it obvious nor being open about it. More to say, it's just silent crushing or secret crushing before. Having no experience in such situation, I'm currently confused on what to do and I badly need some advice. Furthermore, I only have few remaining time to spend with him as I'll be going back home and leaving my work. Also, he's a workmate of mine- a work partner as we are together 8 hours a day. I'm under his supervision and I sit beside him.

How do I show someone in a mature way, that I care and like them? How do I communicate my wants, needs, and feelings to someone effectively?
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