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Oh and the sniper class is useless, but it doesn't require teamwork so it can be sort of fun to play as, until you inevitably find yourself facing a tank.
So me being an Infiltrator = wasted time ._.
...
*sniff*
Now all my hopes and dreams are ruined.
Also I don't even know how to use abilities, handing out ammo, revives or stuffs like that D:
Its been a while but... if you're medic you have a heal ray, it heals live soldiers and revives dead ones. Engineer has something similar for repairing vehicles and a beacon that restores ammo. Heavy assault gets a rocket launcher, although the default is a bit crap iirc. Light assault gets a jetpack and can get C4 to strap to vehicles, but it seems like a difficult playstyle.
Infiltrator is... how to put this, in a game about large masses of players battling it out for objectives, being able to shoot people one at a time at a longer range than usual isn't a good trade off for having no support abilities and being helpless against vehicles. If you play infiltrator enough you'll find yourself facing a bunch of enemy tanks, and just kind of standing around while the heavy assaults do the fighting and everyone else heals/resupplies them.
Its not literally useless, I just think its underpowered. HOWEVER, if you're annoyed at your allies not helping you infiltrator lets you ignore the team fight and lone wolf it, which is not exactly the pro strat but can be plenty fun.
As for vehicles the resources you need to get them are constantly refilling for every player for free. Go to one of the larger bases your team owns, at the bottom there will be tank spawners, at the top there will be helipads that spawn air vehicles. In the infantry spawn rooms you will be able to spend resources to become a MAX, which is a restricted class with power armor and larger guns. MAX, land and air resources are separate and again, free. Although many vehicles start with crap weapons or lack essential upgrades sadly, but tanks will always be able to get kills.
In general try to find a mass of allies and stick with them. You should be able to pick up an understanding of the game just by staying alive and staying near the mass, and helping people or shooting baddies whenever the opportunity presents itself. If nothing is going on you can periodically "redeploy" which puts you in a drop pod over any normal spawn point iirc.
Go medic.
Button 1: T1 Cycler. A basic, poor accuracy bullet spewing' medic/light assault gun. You really shouldn't be using this unless you're under attack. It becomes quite good with the Forward Grip attachment.
Button 2: T9 Repeater. A pistol that fires in three round bursts. Is the weakest pistol per bullet, but at very close ranges with the three round burst is devastating. At close range you're better of using the Repeater than the Cycler.
BUTTON 3: Medigun! Run up to someone who is injured, heal them with LMB. Find a dead teammate with a skull and crossbones above their head, and begin healing them. You can resurrect them with 25% health (more once you level up) You must hold down the heal button and wait until it is full before you can let go and they will resurrect (if they accept.)
You can even resurrect team MAXes, though it takes longer and revives them on less health, and you cannot heal them further.
Engineer is also an easy class to learn. You have five buttons, instead of three.
Button 1: Forget the name of the starter weapon, but it's more accurate than the T1 Cycler. It's quite good with a 1x sight and forward grip.
Button 2: Same repeater as Medic. Same rules apply.
Button 3: Engineer omnitool. Repair damaged vehicles, turrets and MAXes. You cannot revive maxes with it, but you can repair totally destroyed turrets. An Engineer / MAX combo is as feared as the Medic ubercharging Heavy in TF2 is. If you spawn near a damaged vehicle, repair it! Beware of unscrupulous players who will not be careful and may run you down during/after you repair them.
Button 4: To begin with, this is your Ammo Pack. Drop it any old where, and players will replenish ammo if they walk very near it. Try to place it in an area of high ammo use (eg a choke point) or near a MAX that's stationary.
Button 5: Your MANA Anti Infantry Turret. Press once to deploy a turret that is really quite accurate in short bursts, and deals nice damage to infantry (but none to tanks). It has infinite ammo, like the turrets on bases, but heats up with each shot. It's less accurate when prayed and sprayed.