Macros can be a great time saving tool and can help in a variety or situations.... as long as they work. I use a lot of macros and in order to get then to do what I want I use this great site www.macroexplain.com/
Basically this site allows you to type in macros and will explain exactly what it will do. it is hard to explain but if you take one of my macros and post it in you will see what I mean.

My all around pet care macro:

*this will res pet if dead, call if alive, set target as focus, clear focus if target is dead, have pet attack forcus, and cast hunters mark. This is a lot and more then some people need, but I use it a lot and you can always just use parts if you want.

Simple pet call/revive/heal macro

If your pet is dead it will rez, if it is not out it will call and if it is out and alive it will mend.

Simple pet call/revive/dismiss macro

This is like the last one but instead of casting mend pet you will cast dismiss.

Super MD Macro

*it will cast MD in this order, whichever comes first- Focus, if not then target, if not then pet. It will make sure that MD can be cast on the person and if not it will move on to the next one on the list