Anyway, I have read many threads about heating elements, controllers, etc. The problem is, for the most part I have no clue what they are talking about. So I am asking for help in terms that I can understand

So my questions are...
1. Doing 5 gallons runs in my pony keg, what size heating element(s) would I need? I will be using just regular outlets for this.
2. What can I expect an electric setup to cost?
3. In a smaller setup like this, how long will runs take with electric vs using gas?
4. Do I need a controller? If so, is this something I can just buy and not build?
I would greatly appreciate suggestions on elements and any other type of hardware needed. As I mentioned earlier, I am still open to using gas (propane) but would prefer electric because I will be doing this in my garage.
Thanks for your help