Ideally it is one in the same. You would need to decide what carbonation level you want the beer, this would be dependent on style. From there you would get your hands on a Zahm & Nagel Carbonation Chart. Just google it and you should find it. Set your fridge to the temperature you want your beers (38 is good) and cross reference the temp with the volumes desired and you will get the number you want to set you regulators at. Leave the tank on and connected to the keg while in the fridge for 4-5 days and you will have carbonated beer. It wouldn't hurt to give it a shake now and again too.
Ok, now the other options. One is to just set you reg. to 14 and see how it turns out. If it is too carbonated then you would turn it down to 12, too little and you can go up a bit. You still have to wait a few days for it to carbonate though.
Last option; so people opt to turn their pressure up to 20-30 psi and shake the heck out of the keg. (be sure the beer is down to an appropriate temperature, again around 38, before you do this). While shaking the keg listen for the hiss from the gas tank to slow. When it does, pull the gas off and let it settle. Theoretically you could now bleed off the pressure on the beer and but a more reasonable 14 psi on the beer and serve it. This method works well when you need beer carbonated quick. I use a combination of last two method and it works pretty well.
Good luck.
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