Hotbars are everywhere!Follow

Hotbars are great for versatility and custumization. you can create them horizantal, vertical, in a box, small icons, huge icons, etc. If you're looking for it to be vertical, go to window settings, make sure that the window is unlocked and the box clicked enabled is UNclicked and you can move your box around anyways you want. As for icon size, frame, backdrop and spinner, right click on the spinner and a bunch of options should appear to play around with.

Another thing to think about if you havent yet, is to check out different UI settings you can download. If you're coming from WOW I know they have one almost identical to the default setting there, which makes coming to the game a lot easier. If you're not, I would suggest checking out Profit UI, which most people favor for casual gaming and raiding.