Where to find single action sixgun handling basics?

Irelander,  while you're waiting for a better answer, I'm one guy who just sort of figured it out on my own, though there are probably a lot of guys who are better at basic single action handling.
 
During my cowboy action shooting phase, I added the left thumb cock to my standard two-hand hold,  for more speed. But I shoot all handguns with either hand and both hands, and use both left thumb and right thumb cocking on the single actions when shooting two-handed, just to keep in practice. For me, when shooting single-handed, the point of impact shifts to the right a bit left-handed,  and to the left a bit right-handed. Maybe the gun recoils away from the strongest part of my grip a little.
 
On loading, once the loading gate is open and the cylinder freed up, I hold the gun in my left hand pointing down, sort of holding the gun around the front of the cylinder frame, rotate the cylinder with my thumb,  and plug the cartridges in with the right hand as you'd expect.  For unloading, I shift my left hand grip back a little, cant the barrel up, and usually eject all six cases into my left palm,  rotating the cylinder with my left thumb and fingertips.
 
I assume there was an official procedure back in the days of Colt SAA military service,  but I've never seen anything about that.  Might be an interesting browse on the internet.
 
My guess is,  whatever is safe, smooth and efficient for you is best.

Thanks Keith.  I appreciate you sharing your experiences.

Taffin talks a little about SA handling in Single Action Sixguns but I'm looking for a bit more practical info.
Its a great book by the way.

Irelander, you might want to contact Thunder Ranch/Clint Smith.
TR used to host pre-1899 classes, and Mr. Smith wrote about some of his impressions from carrying a SAA. What I recall is he thought the SAA to be a good gun, but with only one cylinder load at hand, which presented some unique conditions. He, probably more than anyone could steer you in the right direction.

The late Dave Arnold also wrote about his conclusions on carrying Single Actions. Mr. Arnold had a long career in Rhodesia that gave him direct experience in the deployment of firearms. His main point was to use the large caliber and power to your advantage.
In both cases, the operative here is thinking and awareness. The decision to carry a gun means one must be willing to use it. It is in the use where the issues arise that are never covered in the movies.
In my own life, any handgun is a compromise between desired capabilities. Thus, the rather slow rate of fire and the slow reloads of the Single Action are somewhat offset by its simplicity, reliability, and accuracy-IF your gun enjoys these features. If it does not enjoy at least simple  reliability, then in my opinion, it is not suitable for carry. However, this is the experience of one who has lived and worked in some very harsh conditions. Different environments might elicit different responses. That said, a good Single Action can fire far more powerful cartridges than an Automatic, and do so with greater accuracy. If this wasn't so, the Single Action would not continue to be popular with handgun hunters, for example.
I still rely on the Single Action, however, the handling and operation of any gun is more than just the mechanical familiarity-it is the inner steel to put a bead on the bad guy and let him have it with an accurate shot. It is all well and good to practice, to use strong and weak hand techniques, to practice using the offhand to operate the hammer, but the real key is your inner condition at the time you are called upon to use your gun. At least, this is my 2 cents worth.

Ruger's website has a series of seven short videos on Single Action Sixguns for self-defense. On the Ruger home the link for 'Ruger Videos' will take to directly to them. Or find the "News & Resources" tab in the bar at the top of the home page, then click on the 'Videos' tab. They are basic, but contain some excellent tips & tricks, & are well produced.
You Tube also has several videos (including the Ruger ones) on the subject. In the search bar on You Tube type "Single Action for Defense' or something similar, & it will show a list of videos on the subject. As with most stuff on You Tube, the quality of the content & the videography varies.
If there is a Single Action Shooting Society (SASS) chapter near you, attend an event & if it interests you, join & participate.
Watching & learning from others will help you develop your own techniques. Then PRACTICE, PRACTICE, PRACTICE!! Like casting a fly rod, hitting a golf ball or throwing a hand grenade, practice develops the muscle memory necessary to achieve excellence of technique, & confidence in your ability.
Nothing new here, I learned it all from others. 

Thanks for the input guys.  I really appreciate it.  I will try to look up the Clint Smith info on carrying a SAA and possibly contact him directly.  I will also check out Ruger's videos...and of course PRACTICE.  I may never carry my Vaquero for SD but I'd like to become more familiar with this gun and how to properly deploy it if needed.

I watched those videos on the Ruger site.  Pretty informative.  That Il Ling New knows her stuff.

Glad you enjoyed them.