Several questions from a newbi.

Using off-perk weapons means you aren't getting the bonuses from your perk for said weapons. If I am playing support, I get extra damage, ammo, and penetration power from using shotguns, but not from other weapons *You can earn money by killing zeds and healing teammates. You still get dosh from hurting a zed just once, but it's a smaller amount. All players receive some dosh at the end of a wave. *There is no real tier list, as every perk shines in some way or another. However, almost everybody agrees that survivalist is useless. *Gear and character choice is entirely cosmetic, with different voice lines for each character. You can have multiples of one character. *You can weld as many doors as you want. However, they will eventually break, even at full weld, due to them having a hidden health bar. *You can run faster by sprinting, automatically mapped to shift. Your current weapon that you are holding does not affect this. *Commando, Support, Demo, Sharpshooter, Survivalist and SWAT all have skills that decrease the time needed to reload. The time to reload decreases as you gain levels with Firebug. *Support gains 1 additional weight over every 5 levels, leading to max of 20 weight at level 25. *Other players get a notification in the middle of their screens, but they only know who is the target of the kick, not the one who started it. *You drop the weapon that you were holding at the time of death. You retain the same amount of dosh you had, but you don't get the bonus dosh at the end of every wave. *Yes, it varies depending on the difficulty, length, and a few other factors. *There are rifles, belonging to the sharpshooter perk. The only gun I would consider a true sniper rifle would be the rail gun. I'm not sure if you consider an M14 a sniper. *Medic SMG, and the Zweihander. There are others that are debated upon. *By default, no. Usually, servers will say in their title if friendly fire is active. *15 points by health by default. Even if you aren't a medic, the pistol is still a fantastic pickup for any perk. *I am guessing you are referring to *Outpost**. It depends, there was a glitch spot that was recently patched on PS4, or people just enjoy playing on the map.

/r/killingfloor Thread