Damage caused by drones:

Preator, Infiltrator, Acrolyte - EM
Org, Hammerhead, Hobgoblin - Thermal
Wasp, Vesper, Hornet - Kinetic
Berserker, Valkyrie, Warrior- Explosive

Damage types caused by NPC's:

Guristas - Kinetic / Thermal
Serpentis - Thermal / Kinetic
Blood Raider - Thermal / EM
Sansha's Nation - EM / Thermal
Angel Cartel - Kinetic / Explosive
Minmatar Fleet - Thermal / Explosive
Amarr Navy - EM / Thermal
Caldari Navy - Kinetic / Thermal
Gallente - Kinetic / Thermal
Mercenary - Thermal / Kinetic
Mordu's Legion - Kin/Thermal
Drones - EM / Thermal
Khanid - EM / Thermal
Thukker - Explosive

Best Damage to use against NPC's:

Guristas - Kinetic
Serpentis - Thermal
Mordus - Thermal
Blood - EM
Sansha - Thermal
Angel - Explosive
Mercenary - Thermal
Arch Angels - Kinetic

Targeting systems

Minmatar - Ladar
Caldary - Gravimetric
Gallente - Magnetometric
Amar- Radar