When you start, go to your messages, the game will give you ten stocked fuel. Be sure to check your challenges, because (at least at this point) the game is throwing out credits and stocked fuel for some pretty easy challenges.
You will want to also go into the options and switch the flight controls to expert/advanced (whatever they call it) and also switch the thrust/brakes and yaw controls if you want to play it like you played the PS2 games.
Yeah, if I remember correctly you have to be friends with someone to join on them. Don't go through the gate unless you want to end up with a bunch of randoms. And enable international play in the options, or the cool people can't join.
They are, at the moment, rewarding stocked fuel (1 fuel = 1 sortie) left and right as rewards for challenges along with credits, planes, skins, and emblems. I don't know how often they add new challenges, though. It could dry up quick.
Either, its cross-play. I got it on PS3 because I have a big TV and the game has big boobs, but in retrospect I wish I'd got it for Vita. Big colourful boobs.
Boobs on the go bro. I'll be a sorcerer. Srsly thinking of going to Gstop to trade in my Ps4 because that shit has NO FUCKING GAMES. I'll be in the fucking military by the time anything decent comes out.