Urgent Queries from an Indian shifting soon to SZN (Shenzhen)

Dear Fellow Forum Readers,
I am in touch with a consumer goods quality assurance services company in Louhu district for a Business Development Role. Can anyone please help me with the below?
1) What is the living cost for 2 vegetarian (Only vegetables as they say in China) adults?
2) What is the minimum salary that a person with more than 6 years of international business development be asking for? Target to save is USD Protected content
3) What are the best places under RMB Protected content or around Louhu district? I am looking for a furnished 1 Bedroom Apartment in a decent and safe location.
4) Which place in Luohu or around do the majority of Indians live?
5) Is it very important to learn Chinese? If yes, how much does it cost monthly?
Looking for urgent responses. Thanks in advance. :)