_Single Action Sixguns_ by John Taffin is a great reference work, available through normal booksellers. Mike Venturino's book is very good, too, and may be available through normal booksellers, or perhaps only specialty sellers. Just in case you receive the sixgun before reading the book(s), keep in mind that you NEVER should lower the hammer from any position except fully-cocked. Not the safety notch, not half-cock, but FULL cock. SAAs and their replicas will gouge a ring around the cylinder, to tell the whole world that someone has been lowering the hammer from less than full-cock. A ring around the cylinder of most sixguns is normal, but it is NOT normal on SAAs and its copies.
If the hammer is brought back to half-cock for any reason, and there are indeed good reasons to do so, remember to pull the hammer to full-cock before lowering the hammer.
Learn it right in the beginning, and there will be no problems. Of course, there is the issue of leaving the chamber under the hammer empty, for safety. Simple: Pull hammer to half-cock. Load one round, skip the next chamber, load the next four, shut the gate, pull to full cock, and lower the hammer. The empty chamber will be under the hammer.
Verify this by looking at the rear of the cylinder from the SIDE of the weapon, until you get comfortable with the whole procedure. There will be daylight visible through the frame at the right spot.