How do you play WoW

I hope this doesn't sound stupid or like I'm trolling. I'm genuinely asking how do people play WoW. I see videos of people doing all this stuff. Using abilities and moving around, 4 hotbars of abilities and stuff. How do they do it. I know you can get a mouse with extra buttons on it be even then that's not enough for all the abilities. I know macros exist but I don't know what I'm doing. Can anyone tell me how to properly play this game. I'm struggling and I know I'm missing something.

Edit: I'm not sure what is even happening anymore. This has gone out of control, its its own thing now. I can't stop it. I wasn't expecting this many responses and I keep getting them.