777 is a new and growing fleet. All of your questions about this fleet are good ones but all that you will find out now will change every single month for the next several years. Therefore it is not possible to answer any of those questions you asked.
You asked a question about arrival and departure times in Local time zone. Why?.. If you have choosen a career in aviation you will fly all times and all holidays so if you have a problem with doing this and you want a 7 to 3, 8 to 4 or 9 to 5 job, then you have selected the wrong career.
The cost of living off of the company accomadation is much greater than living on the company property. You can share a house, apartment or villa with other pilots, if thats your thing, and keep the cost down or close to what the company give you but if you want your own space you will pay a lot more $$$$$ than what the company give you.
If you pass the interview ( you are not sure of this either) you are also not sure if you will join here on the 777. Who told you this? You could join on the A-320, A-330 or the A-300............You are slotted to where QR need pilots and your experience level. The 777 is not the entry point here for everyone. Just because you have 737NG time (2000 hours total which is a only a little bit) you might be offered A-320, A-330 or A-300.
HM
