There are a number of resources that I think are important. Here is a short run down of them.

Find Swings
– has pretty much everything you will ever need to know about using or installing a sex swing.
Screamer Swings – Screamer Sex Swings are the top of the line swings
Trinity Swings – The trinity swings are great for entry level swings
Fetish Swings – The Fetish swings are a lot of fun with several colors and styles available
Wild Side Novelties – The Wild Side is an affordable dual hook option
Whip Smart Swings – The Whip Smart is a very comfortable but narrow swing.

Informational Links
Fetishes – Fetlife it the best fetish community online
Wikipedia – A little bit of background on swings
YouTube – There are a lot of YouTube videos to help you out