Which one is correct and why?
Which ones CANNOT or SHOULD NOT be used?

What have we got here...
What we have got here...
What we got here...
What do we have here...

Thank you.

They all could be correct for various reasons, depending on what you're writing. But a 4th grade teacher would have a different opinion about which is/are correct. Please tell us your choices for correct and incorrect -- and why you made those choices.

Thanks for your time.

See first of all I want one to be used anywhere anyhow!

But I want a literally correct one for a literary fiction.

I personally use these ones :
Lookie what we have here!
Look what we've got.
What do we have here?
What have we got here!

And I was wondering which ones are correct from grammar pov.

1. See first of all I want one to be used anywhere anyhow!

2. But I want a literally correct one for a literary fiction.

3. And I was wondering which ones are correct from grammar pov.

Regional/conversational: What have we got here...

Regional/conversational: What we have got here...

Regional/conversational: What we got here...

1. and 2. and 3. What do we have here...

Thank you for following up

Thank you for following up
Also correct, 1. and 2. and 3.: What we have here...