It would be worth the drive to go to Peppermint in Richardson. They have 8 lb babies to try out the slings before baby and classes afterward. Many of the slings come with directions, but if you are new the class really provides clarity and peace of mind.
You can nurse in most of the slings, but "try" it out to see how you would move baby around and how covered you feel. I use my ring sling more as a cover up plus the extra fabric acts as a "hooter hider" without smothering my son.
www.peppermint.com
I have a ring sling and a Bella Baby Carrier (kind of like the Bjorn carrier). I got the Bella carrier because it fits in my diaper bag but I'm thinking now I should've tried the ErgoBaby recommended by others here. My son is really heavy so I have gone back to preferring my ring sling. Any shoulder straps (even crossed in the back) seem to bother me after 40 min to an hour. I can wear him in my ring sling for hours.
I personally rejected the Hotsling/Native Baby options because I wanted something that would grow with baby and give me more flexibility. I have worn my son in an infant carry, tummy to tummy (he started to like that very early on), kangaroo carry, and hip carry (now that he is a strong sitter).
Choosing is very personal. Select by how it feels and with patterns and fabric that you will enjoy.
Once you try it and are relaxed, I think you and baby will enjoy it. I have a 6 year old so I finally tried it to free up my hands- like you. Get a second one or another kind of carrier so you have one while the other is in the wash.