I would like to ask for tourist visa and documentation for 14 days

Hi,I have a purpose to go to Shenzhen in June. I need a tourist L for 14 days stay. I met a woman who lives there, so I lived and stay with her for this 14 days. Interesting me if I can buy for it already in March? And what kind of documentation do I need for it?

Thanks for the reply

Andrej