Ok. this is going to sound like a very basic question, and I'm a little embarassed to ask. But, as I tell my students, "You should never be embarassed to ask for help, you should be embarassed if you don't". So, here goes. I have owned and shot rifles for most of my life. Sadly, for me, the sling is just a tool to carry them. I need to buy a new one for my AR and the one on my .270 is getting a bit long in the tooth. So:
A) What kind of sling do I want? And please, lets confine it to basic models, not tacticool gizmos. No offense, but the majority of the time its just going to be used to lug the rifle around, nothing more.
B) How do you properlly deploy a sling to increase acuracy for shooting off hand?
Question B is my main concern. I feel that I have been given incomplete instruction here. I doubt I am alone. Any help in this regard would be appreciated by me and probably others.

Thanks guys
FQ13