Get Healbot if you decide to use a mod. Since you have no experience with healing it will be far simpler to get going and use.

As a healer I prefer Grid because I can customize it to suit my needs and can see so much more through the use of indicators. I usually don't use Grid until I start raiding though. I just use Healbot up to that point.

To just be able to toss out some heals while multiboxing Healbot is just fine. I've also used Vuhdo and it's nice as well. I'd put Vuhdo in the middle between Healbot and Grid/Clique as far as complexity.