I want to make a mod for five that adds dogs, the DG2, thundergun, and flamethrower to the map and one that adds dogs to the other BO map

It usually helps if you explain what your question is, instead of telling us what you want to do..

There are modding tutorials out there, so you'll want to look up scripting. The Thundergun is already in Bo1, just need to add it into the mod, so it loads on other maps.