There are always about a 100 ways to work cannabis, and take your time you will find the best one that suits your needs.
Answer 1: You dont need an electric frying pan, I use one cause its what I have, and has a nice way to set low and slow temps, which you want to use for making cannabutter. So you can use your gas or electric stove to make the butter too.
Below is another method to decard cannabis, with some benefits:
https://forum.growersnetwork.org/t/highest-potency-in-your-edibles/
Answer 2: Decarbing is important for edibles as their is no way to activate the cannabinoids if there is no heat. However cannabis does naturally decarb overtime. Its a very important process to do before making edibles as it removes the acid molecule from THCa and CBDa and activates them.
I have never decarbed my butter, as I always get baked with the final product, so what is the point in my eyes. The cooking process of butter, baking the muffins, to me it decarbs anyway!
Hope that helps and shout if you have any further questions.