before i buy TF2, i want to ask questions about the game

Hats- how do i get them, how many do i get, how common is it to get hats

What are your favorite weapons/why

How are the buildings (teleporters/depenser/sentry) are they useful/why

Is it a good idea to leave your sentry alone/why

What are the best taunt kills and are they useful in battle

How common are ammo and health packs

Does anyone regenerate without a medic

What's the easiest/hardest class to master

How convincing are a spy's disguises

Does a webcam work on tf2 or is it only audio of the webcam that works

How often is dying in the game

How do you play on custom maps

How is the sandvich/bonk/kritzkrieg/jarate/razorback and are they worth replacing the previous weapons?