You'll need an Internet connection to download and cache the maps. But, there is no need for an Internet connection when you're out flying.
Is there somewhere I can go to see how to preload the maps and cache of maps( VIDEO TOTURIAL)
The consensus is, if you're a beginner or you fly in close quarters often, you might want to add blade guards, but if you have intermediate experience and plan normal outdoors flying, it's best to fly without guards.
you will have to folk out some more money
Yes but do your research. I would get the ones that allow removal of the top cover without having to remove all four of the motor mount bolts. Also, when the day comes that you want to remove the guard mounts, you MUST remember to use the ORIGINAL motor mount bolts, NOT the prop guard motor mount bolts. Very important.
There are some knock-off batteries, but I wouldn't trust them after shelling out hundreds for a Phantom.