Give a man a fish, and he will eat for a day. Teach a man to fish, and he will eat a lifetime. Here is the easiest to use priming calculator I've found. http://www.northernbrewer.com/priming-sugar-calculator/
For the temperature, you are actually supposed to put what the highest temperature your beer was at while fermenting, because that will affect how much residual CO2 is in the beer from fermentation.
I would strongly suggest using a bottling bucket and batch priming. Much more precise, and much less risk of bottle bombs and whatnot. At any rate, if you aren't using one, divide the estimated number of bottles by what it tells you, and then you should be good to go.