If you're just playing two toons...
You might want to spec the Shaman as Resto.
Having both a tank and a healer can make instances much easier to do.
Oh heavens I haven't even considered doing any dungeons yet. That's light years away for me. I'm just doing quests. I wouldn't subject a group to running with me while I play two any time soon. My shaman is ele. I don't think it makes much difference questing.

I have not problem playing the tank. I probably wouldn't have any problem keeping myself healed. Where I fear I'd run into issues is healing the rest of the group while staying out of the yuck muck and peeling adds and all the other stuff that has to happen.

If you want a ranged class to face their target.
They need to have Click to Move enabled.
You would then press their IWT keybind.
And then any movement key (such as down arrow), to break the movement.
If I hadn't done exactly that I don't see how it could be working so well for my paladin. I thought I mentioned above that I'd already seen the IWT instructions, followed them, and it worked for the melee but not for the ranged. I'll double check. Maybe I fat fingered something. It looks to me like ranged respond differently than melee.

If your software is something like IS Boxer.
Macintosh.

So far I'm not completely happy with any of the software options I've tried. Plexer, MultiLaunchBox, and Clonekeys. MLB seems to be the best of the 3 choices. I like it because I can see at a glance whether I'm broadcasting or not, but don't like that I can't hotkey the on/off thing. The keybind the author claims does it won't work.

Plexer has a keybind that works but there's really no good way to see whether I'm broadcasting.

Minor issues I guess.