I am downloading a software called "SuperDuper" now for the cloning. I have the youtube video up that walks me through to.
So the very first step I believe I have to plug the SSD in with the USB and clone my files.
Theguy at best buy said I have to pay like $100 for the new OS?
I see you edited your post. Based on your comment you did not want to keep any data, I suggested the install in my post above. That will get you on the version of OS X that came with your machine for free.
If you do want to keep your data and do a clone, I suggest using the trial version of Carbon Copy Cloner instead of SD, as CCC copies the recovery partition over and SD does not.
If you either DL the OS as I described, or clone it over you will not need to buy any OS at all.
You can skip a step and just put the new drive in the Macbook then option key boot to the old drive in the USB enclosure, then clone the old to the new with CCC. This saves you moving the new drive in and out of the enclosure for no reason.
After you do the clone go to System Prefs and in the Startup Disk pane select the new SSD as the boot drive.