Yes you may take an empty holster on board and if you check it it will not be confiscated. You can even check a gun at the front ticket counter as long as its unloaded and its in a hard sided locked case.
No not really. You just need to be there in time for the checkin in of luggage so that all the process will run smoothly.
Yes. Do not bother trying to ship them in or bring them in via airplane/luggage. They will be confiscated either way.
Put it in your checked luggage unless you want it confiscated during security screening...
how much luggage am I allowed to bring
I guess so. But you surely can't bring canned food in you carry-on luggage.
can we bring our ps3 on hand luggage
No
Not legally in international flights.
If it is in your carry on or luggage.
Nope not in your carry on but you can put it in your check in luggage.
Electronics of any kind - they'll be confiscated or put in storage.
Sure it's not a liquid, so why not?