Programs to use to start editing HaloPC:
-Sparkedit: scenery/vehicle/weapons/items/teleport placer
-HMT: used to edit almost everything in HaloPC, bitmaps, projectiles,models,etc.
-HHT: simillar to HMT
-Photoshop,Paintshop Pro: painting program used to make/edit bitmaps in Halo
-Milkshape:For editing models
For HaloCE:
-The HEK(Sapien, Guerrila, and Tool):
*Sapien->Scenery mover/placer, radiosity creator
*Guerrila->Tag editor
*Tool->level exporter/compiler(everyone hates it though

)
-3ds Max/Gmax: Modeling program used to make guns, vehicles, items, and the level itself
Please though, from now on search halomods or google to find what you are looking for. Post here as a last resort
