Firstly, some guns are more effective against certain enemies. Here is a list of which gun is best against which enemy.
Spoiler: MonsterWeaknesses
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Zombie class - axe
Hellhound class - shotgun
Commando class - chaingun/plasma gun
Imp class - shotgun/super shotgun
Lost Soul class - fire extinguisher/plasma gun
Pinky class - shotgun/super shotgun, resistant towards axe
Cacodemon class - plasma gun, malwrath weak towards axe
Pain elemental class - plasma gun
Revenant class - rockets/plasma gun, resistant to shotgun
Mancubus class - rockets
Archvile class - fire extinguisher/plasma gun
Baron class - shotgun/super shotgun/rockets
Kronos - BFG
Cyberdemon - BFG
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The original source of this information along with a few extra hints can be found here:
Hastily Written: The blog that has stopped caring: Doom RPG cheats
Also, there is a debug menu which can be accessed this way:
You can enable
God Mode, get more guns and ammo, level up, noclip, disable monster AI, change levels, benchmark, etc
Ryan.