In the actions window the furthest right tab looks like a speech bubble
Click that, choose a blank box, right(?) click it, it opens a macro box
Type
/cast <#1-8> (which ever spell gem is appropriate)
then on the next line:
/"channel" <your text>
Also, inserting '%t' into the chat line will substitute the name of whatever you have targeted.
On live, as a joke when I grouped with my RL cleric friend, my shaman had a macro that said:
"Don't stress yourself, you lazy cleric, I'm healing %t for you!
/cast 8 (heal spell loaded in bottom spell gem slot)
As for 'higher level macros'- there aren't any really. There can be some fancy stuff done, but for most mortals, if it doesn't fit on the 5 lines of the macro box, you can't do much beyond that.
The basic commands are
/cast <#gem>
/"channel"
/pause <time in 1/10 of a second>
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