what are the documents if im traveling to macau?

Norma, in principle, you can enjoy free entry to go there for a stay of not over 30 days by providing your passport, the return ticket, accommodation arrangement and enough travel fees (at least 5,000 MOP as show money). But in real practice, the immigration officers have the right to decide if you can enter according to the different situation. All you can do is to provide all the required documents. If possible, you’d better ask your friend to issue an invitation letter to you.