It appears that soldering copper tubing is like all other opinions, and they all stink but mine. I don't think you can go wrong with any of the suggestions above.
I installed over 100 ft. of 1/2" copper for my compressed air distribution system, carrying 110# pressure, a couple years ago. I used the standard Burns-o-matic torch you get at the borg. The standard propane will and does work.
To use any of the gases or torches, you must start with clean copper. Use a joint cleaning tool, emery cloth, or steel wool if you must. Then coat the inside and outside with flux that is made for copper tubing.
Evenly heat the joint, and you will know you have a good joint with you see the solder sucked up into the joint by capillary action. Do not move the joint in any manor for a minute, and do not throw water on it it cool it. Any movement of the joint while still in a plastic state will ruin the bond of the solder to the copper.
Sweating copper is not magic, it just takes a little practice.