1. A No-objection letter from the applicant's company stating his or her position ,monthly or yearly salary is required rather than the Invitation Letter from China
2. You can download the visa application Form from https://www.travelchinaguide.com/embassy/pdf/visa-application.pdf
3. yes, you have to fill the application form for them.

The following documents are also required for tourist visa application:
1. Original passport with blank visa pages and validity of more than 6 months;
2. UAE resident visa valid for more than 6 months. (Excluding non-GCC applicants);
3. Application Form which must be completed neatly and signed by the applicant;
4. One passport photo (and the photos of the applicant's accompanying persons included in his/her passport if they plan to travel with the applicant.);
5. Copies of the data pages of the applicant's passport and UAE resident visa.