Experiment. Whatever addon you like to use to heal, someone else might not. So play around a bit and find one you enjoy and are comfortable with using. Because that's what's important.
To set spells just open it and go to spells.
At the top choose the mouse button you want to set
below that choose the modifier (ex: shift click or alt click)
then choose spell from the drop down menu and select it.
At far as spell binding choices. Just go with the most commonly used abilities bound to easiest to use keys.
I havent played my shammy in a long time, but I had Riptide on button 1 (thumb button) GHW left click, Chain heal right click, Earth Shield middle button, healing surge as Shift left click.
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