I'm not much of a computer person so when the idea of moding my game came up I was at much of a loss. I see guys say download here and then I click on the button and then I guess I download but then afterwords I'm clueless.

The search button is your friend.

All you need to do download the mods..look at the file type (.something)
then go to "C:\Ace of Spades" in your hard rive and there will be folders called
kv6
png
wav
if the file extension is a png put in png ( and replace the old one) etc

if you can not see file extension.
go to control panel and search folders.
you should see "change search options for folders and files"
on the tab called "view"
make sure the box that says "hide extensions for knows file types" is NOT checked
if you still need more help send me a PM (personal message)