Which sentence is Correct Among both
How much will you pay for me
How you will pay for me
"How much" is asking for a quantity. "How" by itself is asking for a means or method.
Example 1:
How much will you pay for me?
I'd pay up to $20.
Example 2:
How will you pay for me?
I'll pay with a credit card.
By the way, both sentences sound, at least taken out of context, like the speaker is asking the person about buying him or her, like you would buy a slave or a prostitute. Perhaps the intent is that they are asking about buying something on behalf of him or her?