Not to overreach SandS but this subject needs prolixity imo.
The way l was thought:
A good turtle bag has three straps with velcro or a clip, one left, one right, one on the top to avoid mix-ups.
The luff and leach of the kite usually have green and red strips all along the edge from head to clew.
Grab the head, facing the back side of the sail towards you. Run along the green strip to the clew, checking the proper lay of the sail all along. Do the same along the red strip. Now the edges are laid out properly. Stuff the sail into the bag middle part first and clip the head and clew rings to the proper straps, left, right, top. You are done. If done well, no mix-ups, ready to go.
Practice with a totally, intentionally twisted, messed up may be even wet kite few times. Have a beer! (You'll need it!)
I found, as l mostly sail on my own, to launch a kite, easier from the cockpit. You run your sheets o u t s i d e of everything and hook up your barber hauler as well. Clip your sheets together!
If you decide on stb pole, clip your guy onto the pole (this is the only time you leave the cockpit) and hook up your pole's up and downhaul as well. Raise the pole when back to the cockpit then pull on the sheet bringing the guy back to the turtle bag on the port side. Hook up the clews and the halyard which must be free to run, but secure it not to have a runaway kite on your hands. When ready to launch, pull on the guy, slowly easing out your kite until the clew is at the pole's end. Keep pulling until the pole is about a foot from the forestay. Secure guy. It should be fine as your genoa should cover the kite running across it. Let your sheet out about ten feet, drop or furl your genoa about a foot, free the kite's halyard, launch. The kite should be sheltered enough by the genoa to launch safely. Adjust guy, sheet, barber hauler, drop genoa, readjust all, sail away, have fun!
You do not have to have a pole if so desired.
Recommended reading, Andrew Evans's book about single handed sailing. Free download!