The kits that we sell are targetted for 5 gallons, and we include a 4oz. bag of corn sugar. I recommend 4oz. corn sugar in 2 cups of water. Bring to a boil for 5-10 minutes, then cool to 75-80°F. Add this into your bottling bucket, and rack your fermented wort on top. I take a VERY CLEAN and VERY SANITIZED stainless steel spoon and stir the mixture for about 10 seconds, trying to prevent any splashing or oxidation. Continue to bottle, leave in 70-75°F for 2 weeks (keep covered from light), then put one in the fridge and drink it one day after allowing it to chill / settle. If that one is good, I put the rest in. If that one was undercarbonated, I wait another day until I try another beer. Continue the process until you have a carbonated bottle, then put the rest in the fridge.
Hopefully this helps. Also - just as an FYI, cold crashing a beer is when you bring the temperature of your fermenter down to ~33-35°F. This "crashes" most of the floating sediment, yeast, hop particles etc to the bottom of the fermenter, and usually provides you with a clearer beer in the end. This is not recommended for bottle conditioning however, simply due to the fact that you're not going to have any yeast left in suspension to ferment the priming sugar in the bottle.
Cheers!