If you are new to DA revolvers or the shooting sports Id check these sources:
www.midwayusa.com www.ruger.com www.gunvideo.com www.nra.org www.deltapress.com www.paladin-press.com www.brownells.com www.natchezss.com
I'd suggest No Second Place Winner
by Bill Jordan & a few works by Elmer Keith. Keith is considered a top handgun hunter & he R&Ded the magnum handgun rounds used today.
Ruger has a few well made videos with retired LE officer & instructor Dave Spaulding. He is a good trainer & offers a simple, easy to follow style.