Which/what

This should help you:

Thank you and I want to make sure of this sentence "when are you gonna/going talk to her"

When are you going to talk to her?

You can use gonna in place of going to, but note that it is very informal. Definitely avoid it if you're writing a school essay or a cover letter, for example.

Thank you so much, if u you see that someone just came to work and he's moving a lot at first can you say to him "are you warming up"

I'm afraid I don't understand the question. Can you paraphrase and give more details?

I mean is this sentence right "are you warming up"

ItaliaI mean is this sentence right "are you warming up"

Are you warming up? is grammatical, but I can't tell you whether it's an appropriate question in this case, as I don't understand your example.

Ok I mean when a friend at work comes and before he starts he tries to move back and forth like he moves in a way that makes you think he's warming up I don't know if that's clear enough

Is he doing stretching exercises and such? Then yes, that's a perfectly suitable question.

At first, I pictured a guy arriving at the office and then pacing and fidgeting about. What an imagination.

Hhhhhhhhhhhh I'm sorry about the bad explanation