what are the documents, required to carry while travelling to China & Hongkong

DearSir/Madam,

I am an Indian citizen and planingto travel to travel to China via Hongkong by next week.
I have already obtained Chinese tourist visa.

Since it is my first visit to China/Hongkong,I will be thankful,if you could advise me on the following,

1,what are the documents,I required to carry while travelling ?
2,Whether Entry permit is required to for Hongkong
3,How can I travel from Hongkong to Shenzhen by road
4,How can I book advance bus ticket from Hongkong to Shenzhen
5,How can I get a English speaking Guide in Hongkong and Shenzhen
6,whether health certificate is required to enter to hongkong & China
7,Whether Embarkation card is to be submitted at to customs/imigration before boarding
I will be highly thankful,if you could kindly advise me on the above matters.

Thanking you