What are your essential tools for good gaming?
Trust, consistency, and consent. If the people at the table trust you, and you trust the people at your table, then the stories you tell and the directions you can take your stories are going to be many and varied and extremely interesting in all sorts of ways. If you are consistent in how you resolve things, then your table will trust you and know that you are keeping their wellbeing in mind (and yes, wellbeing is an important part of 'fun', which is why we all do this RPG thing anyway). And if you have the consent of your players, and they know that you won't do something they don't want to do without asking, then they know your consistent message is one of trust and common good. With those three things, you can tell any story, in any setting, and have a good time doing it.
Oh, wait, did you mean stuff like dice and shit? Oh. Well, I have some poker chips I use as x-cards, and 3x5 index cards for basically anything that needs or wants to be written down, and some mechanical pencils to do the writing. That's about it. Anything else is window dresssing -- I like my iPad as a GM screen / lookup tool, and sometimes I'll use my laptop -- because anything outside of the people you're playing is just there to act as props, really.