First off, I'm not sure which Bernzomatic you have - I have the TS4000 (trigger-start - which is VERY useful - and compatible with both propane and MAPP gas). Bernzomatic makes very good torches, so you're in good hands. Don't worry - you do NOT want an acetylene torch, especially if you are a beginner. They're much hotter, but also more volatile, and more difficult to work with.
Some simple soldering tips: apply the flux liberally, as this will help draw in the solder once you start soldering. Heat the fitting, not the pipe. Heat only one side of the fitting, and test every few seconds by removing the torch and touching the solder to the OTHER side of the fitting (on horizontal joints, heat the bottom of the fitting, and apply the solder from the top). When you see that the copper is hot enough to melt the solder on its own, put down the torch and apply the solder to the fitting - if fluxed properly, the joint will suck in the solder until you see a thin ring of silver where the pipe and joint meet. Don't put on too much solder, though, or the solder will go all the way through the joint and form a glob on the inside of the pipe, impeding future water flow.
Oh, and one more important thing: you CANNOT solder a pipe that has water in it. Water will eat up all the heat, and even if you waste half a can of propane on it, you will not get it to ork. Therefore, when soldering onto existing plumbing, make sure the water supply is turned off and the pipes are dry; if water is still trickling through and/or you cannot easily get rid of the water, try stuffing a small piece of bread into the pipe to absorb the moisture. (Don't worry about how to get rid of the bread once the pipes are soldered shut; when you turn the water back on, the bread will dissolve from the pressure).
Good luck, and have fun!
Moishe
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