Help with New Race Head Model

[BluFawx]

I am attempting to create a mod that adds a new race, Half-Elves, to the game. I want to get the imperial head model and make the ears a bit pointier, and make it have a little more elf-like facial structure. How do I access the meshes? Can I use Maya? Do I need Blender? What do I use for all this .nif stuff? I need help please.

 

Thanks.