Prop Firing SWEP

I kno how to make a basic swep (prop shooter, name, ammo, etc.) but i dont kno how to make primary fire 1 prop and secondary fire another prop (tht explodes) which code do i use for that

(User was banned for this post ("UTT" - SteveUK))

Well the same, only this time use the secondary Swep hook, put a timer and spawn an explosion.