So your life as a -insert job here- has come to an end via the zombie apocalypse, now you begin your stuggle for survival in the post apocalypse.

Too many Zombies? Go to Settings, then difficulty, and set Zombie Flow and Zombies in locations to Low. This will make things easier but not too easy, now there won't be a horde waiting for you in every building.
I recommend making a lot of custom stuff, occupations (soldier, pharmacist, student, etc.) items (military gear, canned foods, chainsaw, etc.) but keep realism in mind when doing all this.
Now, with doing all this, I've only beat one game... this game does everything in its power to kill you. You have been warned.
Also,
All ye who enter here abandon all achievements

What kind of Zombies are these?
The zombies in this game don't seem to adhere to any specific type, but good news, they can't run. So they seem to be classic Romero zombies with a penchant for mutilation, and oddly enough, somehow getting into locations from third or second floor entrances (we'll address that later).
HOWEVER it seems you DON'T have to destroy the brain to kill them, although it is the most effective way to do so.
The Infection itself spreads through contact with the infected, mainly through bites, but can be contracted through cuts and even bruises (somehow).

In the game, your group is ALWAYS in some sort of small town, which ranges from suburb to like a middle of nowhere type town, but every town has the following:
1 Police Station
1 Hospital
At least 1 House
At least 1 Store
At least 1 Warehouse
At least 1 Factory
There's usually a school as well, but not always

Buildings and their loot vary considerably, but here is a general outline of them based on my experience:

House:
Number of Entrances: Low (6-15)
Zombies inside: 0-2 (Low) 0-4 (Standard)
Loot: Food (Common-Always) Tools (Common) Weapons (Occasionally) Armor (Occasionally) Car Parts (Uncommon)

Shop:
Number of Entrances: Low (4-8)
Zoombies Inside: Low (0-3)
Loot: Food (Common) Tools (Common) Medicine (Uncommon) Weapons (Uncommon) Car Parts (Rare)

Police Station:
Number of Entrances: High (20-30)
Zombies Inside: High (6-20)
Loot: Weapons (Always) Armor (Always) Tools (Uncommon) Food (Uncommon) Medicine (Uncommon) Car Parts (Occasionally)

future contents include, but are not limited to: Game Modes/ Stories, Game Logic (That doesn't always make sense), Relationships, Basic Survival, Locations and Loot, Advanced Survival
Suggestions are welcome, remember these are just suggestions, play how you want to.