1. Well you basically go to forum and post link exchage request, at this forum here is where to post it:
http://forums.ukwebmasterworld.com/r...link-exchange/
2. If you stick around a forum for example this, you actually get to know people who will help you, for example this are many nice guys here like Bagi, Like Eric, OWG etc etc, most of them have good website, when I need a link (or some members of this forum that they know) they just give you a link when you advertise for link and they can help, other may sell it to you at discounted rates etc etc so just join other people post let then know you are here
3. You can do a search for link exchange (I see you already have a link from linkcentre) do a few more link that
most of all, don't get tired, sales will follow as your site gets more links and ranks higher in search engines.