timothy585,
Gonna go find you a pic to explain my answer.
EDIT: damn...that was easy.
I'm an electrician - work commercial or industrial - don't do houses - not many, anyway. But brick is brick. I've set anchors, or drilled through more 'brick' walls than I care to remember.
Look at the pic.
Find the places indicated as
webs. That is where you want to place your anchor. If you drill into the
cell, the sleeve anchor will just flatten itself out - suck all up and deform. A sleeve anchor needs a solid hole - well, call it a tube drilled in a web - to properly fasten.
If you use a 1/4" sleeve anchor, use a 1/4" masonary bit. Hold the bit steady - don't allow the bit to wallow-out the hole. I think a coupla 1/4" sleeve anchors should hold the shutters just fine. Depending on size and the supplied installation instructions.
Some brick is very soft, and you can use a masonary bit and a regular drill. Othertimes with hard brick, you'll need the masonary bit with a hammer drill. (I prefer the Bosch Bulldog for work. I own a cordless DeWalt drill that also hammers)
I NEVER use the mortar to hold anything. Then again, I don't hang shutters - it'd be a panel, Kendorf, etc.
Hope that helps.