you need the following papers to apply for a China Tourist visa.
1.Passport: Your valid passport must have at least six (6) months of remaining validity and at least one blank visa page in it.
2.Application form: One completed Visa Application Form.
3.Photo: one recent passport style color photo of 2x2 square inch, glued or stapled on the application form.
As for your marriage in China, please read th einfo. on the website below:
https://www.travelchinaguide.com/embassy/visa/marriage-registration.htm