Invincibility. How do i make it work?

Use notepad to edit the "Gamerules.lua" file in the same folder as the previous cheat. Then look for the line:
"ai_to_player_damage = 1, 1, 1, 0.5, 0.5, 0.5"

And change the line so all of the numbers are 0
Example: "0, 0, 0, 0.0, 0.0, 0.0".

Always make a backup before editing files

Use Notepad to edit
"\\Scripts\\Default\\Entities\\Weapons\\BasicWeapon.lua"
look for entry "local unlimitedAmmo =0"
change it to read "local unlimitedAmmo =1"
Click "file" and "save"

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Note - Always make a backup of any files you edit in case you make a mistake.