Hello and welcome to Multiboxing!

Multiboxing itself is in the grey zone as it is NOT bannable. However Blizzard does not support it. So they won’t help you with it.

Isboxer is as easy/hard as you want to make it. Check out MaRai on YouTube. He has a great 101 series and setup guide.

Ranged is generally the “noob” friendly suggestion. And you can box on different classes. Many people use macros for this. So you macro a rotation on all classes.

noob multiboxer, don’t worry about failing. Keep trying and don’t give up. Also set goals with boxing. What do you want to do? Stick with those goals.