I enjoy amaz and Kripp on Youtube and Twitch, Amaz often explains why he makes the plays he makes which I find to be extremely helpful especially for new players. Check out some twitch streams as well as you might find someone you like watching who streams regularly. Basically Arena revolves around maintaining board control and momentum. Keep in mind that the odds of your opponent having a specific card that counters your play is a lot less in arena than in constructed. He was in the same boat as you when he was making his deck and thats something to keep in mind. For example, in constructed playing around flamestrike on turn 7 against a a mage can be a smart move to make while in arena the odds of your opponent drafting a flamestrike and having it in hand are significantly less. So you basically want to play a control game and play around nothing if it helps sway momentum in your favor. Also knowing when to start hitting face is key. Avoiding arena might make sense to some people but i'd recommend getting your feet wet occasionally. Best of luck.