The cocker spaniel club is your best port of call for finding a list of reputable breeders so you can start to make enquiries.
Regarding fencing, it's always a good idea to have secure fencing no matter what breed of dog you have. For cockers it doesn't have to be particularly high, a good sturdy 3 and a half or 4 foot fence would be fine.
To get the icons, look just above the text box when you're typing a post and you should see a row of smiley icons, just click on the one you want and it should appear in the text
Good luck in your search!