Improve my build

I've been theorycrafting with this build for half an hour or so, and I came up with this:

Fire Staff Build

Help me improve it, I'm new so I don't really know if I wasted any nodes etc.

I'm going with a staff build, and boosting my Sweep with fire damage whenever I can get it. I'l probably use infernal blow as my singletarget attack, and then I don't really know what I'll use. As many buffs as possible... What do you think?

Thanks!