workflow and authorisation

Hello, I made an email request to the customer service site. I am communicating the same request to you.

I was thinking of using WorkFlow to advance tickets through a role and responsibility process. In this context, I wanted a ticket creator not to be able to modify a ticket, even his own, which goes from the status "New Ticket" to "in analysis" or "to be executed".

The only thing he can no longer do is to change the status of the WorkFlow because I have taken this right away from him. He can modify his ticket at any status. How to limit the authorizations to modify the tickets which have evolved in the Workflow?
I would like to ask you if it would be possible to have a submission to develop a workflow that would add the authorization, not only to modify the status according to the profile but also the rights on the entire ticket.

Would it be possible to develop this function?
How much would it cost?

Okay,

What should I do next, please. Can you send me a quote? A delivery date?
We want this feature
Thank you

You write "Please reply to the email I sent and provide the requested information.
I'll send you a quote. " Ok! What should I answer, what information? Are you forgot an attachement?

Thank