How do I negotiate money and services?
It is up to you alone to decide whom you want to have as a client. You can refuse at any time without having to give reasons.
Tell the client what your service costs. Only start working after you have been paid the money.
You do not have to do anything you don't want to do. Make it clear what you are offering and do not let anybody persuade you to do something you are uncomfortable with. You do not have to put up with someone ignoring your boundaries and doing something against your will.