I am scared of understanding the game .

In this game, what are the no. 1,2,3,4 ?
A more details about Hulk, runner and walker. What are they ?
They are the 3 types of Zombie ?

How to search ?
How to get weapon ?
Barehanded at the beginning ?

Player dies after 3 hit. Does it matter what damage each hit takes ?
Cause the Hulk will need only 1.5 hit to kill the player if he has 3 lives, as the hulk inflict 2 damage each hit.

After signing up, what happens if I miss to play the game one day ?
Does it make me disqualified or count the game anyway with no moves being made by me and if a zombie inflicts 3 hits while I am away, then count me as dead, but if they don't hit, then I will survive ?
As you mentioned, the zombies move forward noises. So, if missing one day doesn't make me disqualified, then I am less likely to get hit by zombies as other player might make noises.

I will ask again if I have got any more questions.

I figured out the game pretty much. But afraid to start. As this is a co operative game, my unthoughtful actions could harm the other players.