@DracoTheGreat - adding the camel unit isn't hard at all - just need to decide what its capabilities are, e.g. combat strength, prerequisite tech, obsolete tech, cost, free promotions, etc. Same for the elephants.
If trying to make the Camel Archer unit available to all civs, you'd need a replacement "unique feature" for Arabia, as all playable civs must have a Unique Ability, and at least 0-2 Unique Buildings and/or 0-2 Unique Units (but 2 or more of either of these).
Adding Camels as a resource, however, can be a problem, depending on how you do it.
If you want the new resources on the map, this it is quite a bit trickier. The artwork and animations are the hardest part, adjusting map scripts to add Camels to maps would be a challenge. It can be done, but it isn't easy.
If you want the resource to become available when a certain building is created, it is actually not hard at all.
I wouldn't mind taking a stab at it, but need to get some ideas about how the unit and resource should be built. I've created a thread in the "Civ V Mod Components" area:
https://forums.civfanatics.com/threads/camel-unit-resource-mod-collaboration-thread.625074/
Please review the thread and see if you can help me construct the mod the way you envision it. Thanks.