Need help with H1b visa

Hi, can anyone help me with the few questions I have.
1, do i need to pay the visa fee before making an appointment?
2, If I have to pay first, what documentation my family need in order to pay the fee for me?
3, do i need to fill out the DS160 before making appointment?
4, is it true that H1b visa appointment only open on Thursday in Guangzhou?
5, anyone knows a good place to stay in Guangzhou?

Thank you! any help is appreciated.