

Applying for the visa a lot in advance: my doubts
Hello everybody,
I am organizing a long trip and I have to apply for several types, the chinese one being among them. For this reason, I am forced to apply a lot in advance: I calculate I will enter in PRC around the 25th of May, 2014, and I should apply for the one probably in the end of December, 2013. I read this article and had a look at the application form, and I have doubts concerning the following points:
1) Date of validity is "3 months or 6 months"; of course I need 6 months, since I apply in December to enter in May. In the application form I have to choose between "one entry valid for three months from application" and "two entries valid for 3 to 6 months from application". Does it mean that to have one valid for 6 months I am forced to ask for double entry?
2) In the form I am asked to write the exact date of my entrance, but of course I don't know it precisely, I can guess it within a range of a week. Is it a problem if I am not precise with this date?
3) I don't have any reservation of a flight to enter; maybe I will fly to leave the country, but I am not going to book such a flight on time to attach its reservation to the application form. For this reason, do I need to ask a tourist company for an invitation letter?
4) To have my long trip I will have to leave my current job: for this reason, to avoid troubles with my company, I would prefere not to write the address and telephone number of my company in the application form, and rather declare myself "unemployed". Can this be a factor of risk to have my application rejected, because maybe chinese government thinks I am going to enter as a tourist and look for a job?
Thank you very much for your patience, and I hope you can help me with your answers.