Glad you chose Mint, and even more glad you like KDE
Future will show you you made the right choice
There is, of course, a graphical way to go this (KDE gives you options, not like some other desktop environments whose name starts with 'G'
Just go to Menu -> system preferences -> desktop -> behaviour
And there is a tab in which you can choose which icons you want to appear on your desktop.
(i'm not sure about the names since i have a french system...)
Hope this helps...