So I work at a restaurant and we've got some good looking girls there that I want to practice flirting with. Most are older than me by 5 years

I decided it'd be a good plan to flirt with the ones I barely see. But literally every guy in there it's flirting with every girl. There are only a few notable ones.
One guy is 29 and has charm out the ass. He is just a natural at conversation in general, and makes everyone smile. Anytime he's there it's a party. But he told me it's still hard for him to get girls which I don't see how.
Another guy is like 40 and he is really sleazy. Always talking about girls bodies and making sexual remarks to them. They respond nice but I can see they're like "wtf"
Another guy is 25 and just tries way too hard. It's like he's trying to act like the first guy but it's just so unnatural and forced.
And another guy is my age (20). He's a strange dude. seems like a shithead but he is always starting random strange conversations with me (mostly about dicks) so it gets me into my social mode. He seems to zero in on a certain girl and go for it Full force.

As for me I don't talk too much. girls will eventually say something to me in passing but my mind is shut down do I am usually like "wut". Sometimes I'll make a weird face at them. But I want to work more on my social flirting.

Any tips for opening and flirting in a work environment. I guess my biggest focus is opening and from there or it should come naturally

From what you are saying it sounds like there is no real competition, the guy that is a natural at conversation could possibly be but remember all that conversation only gets you so far, eventually you have to be confident enough to flirt with the girl and make her attracted to you, something he could be missing.

So i don't think you need to worry about that, the fact that you are quieter is probably not a bad thing either, however you should make sure that when they talk that you come across as cool, confident and funny. The girls will probably start seeing you as the cool one and will give you a chance to flirt, if they make fun of the other guys while speaking to you its probably a good sign too. If its at work then don't force it, chances will come naturally, just make sure you make the most of them.

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Serving is the best way to get exposed to a bunch of different girls. If you're really that shy I would say not to skip ahead and all of a sudden try to be this fun flirty guy. How about just challenging yourself to engage them in a normal, non boring coversation. Just talk and relate and joke around with them.

Get good at speaking with and engaging women outside of that environment and it will become second nature to you. Don't rely on the small amount of women there to practice on, that is too small of a #. Practice on a wider net of women. There are women everywhere. Get used to speaking with them and flirting with them.