I would probably fight the invaders. Why? There's not point in dying unless you go out in style. I would take 2 of my good friends, 1 of which is in Marine Corps training, both of which are good with firearms. For weapons, I guess that I would have to be realistic here. Sure, if I could take any weapons I wanted for my group, I would get a 50-cal rifle, M249 SAW, an M4 and several explosive devices. Realistically, I would proabably get a shotgun for close-up work, a Beretta or Glock for a sidearm, and a .22 hunting rifle. You might ask "why the .22 rifle?" as 22-caliber rounds lack stopping power. The 22-caliber ammo is plentiful, lightwieght and let's face it, if you're trying to snipe, you're going for kill shot and not stopping power.
Things I would not do: Firstly, I wouldn't try to be the hero. The heroes usually die the quickest trying to show off. The second thing that I would not do is flock to a hospital, police station or other governmental institution. This is really a simple one, because if China invaded, those aformentioned places would be the first locations people would flock to. I would try and keep on the move, but able to defend structures at a moment's notice. The third thing that I would do is stay as incognito as possible. The invaders will tend to make a beeline for Rambo who decided to try and take out there base in his underwear armed with a rocket launcher than the guy minding his own buisness. Remember, if you get caught, you can't fight.