Just started workin with the geck, would like to know how to increase weapon fire rate, and how difficult it would be to change the appearance of the labcoat armor to have leather shoulder pads, and a utility belt

Changing a weapon's rate of fire is pretty easy, you can do that in the properties of the object. However, if your changing something in the game, you will want to give that object a unique formid so that you are not applying these changes to every same object in the game, unless you want everyone to fire faster at you.

As for adding Meshes and Textures, that is more complicated, and you have to use 3rd party programs like Nifscope, Blender and others.

Here are some tutorials

http://geck.gamesas.com/index.php?title=Main_Page

I strongly recommend you view some of these videos (they are for Fallout 3, but things work the same way in this game)

http://www.gamesas.com/topic/952768-geck-video-tutorials-on-you-tube/

So as in creating a unique recharger rifle with higher fire rate in the geck i would use the weapon properties then right?
(I am making a personalized weapons and armors set to place outside docs house for me to get when i start playing)
Thanks for the help