Out of the ones you listed I would go with an ergo. We used one from birth and I love love loved it, still do and Ashton is 11kg. I use it as a back carry now and it's so comfy and supportive. Only one tip is that the infant insert isn't good for bigger boobies. I had E in the beginning and couldn't get it in comfy so after a play I worked out a way that Ash could go in and be comfy without it.

I've used a pouch/sling before and found them very akward and uncomfy, could be because when I did use it my baby was 8kg, and it really pulled on one shoulder and gave me a sore back.

If your open to suggestions, I say go a Mei Tai. Out of all the carriers I have that is my fav by far. It's so great and the front and back carry are very very comfy, it's straps but it's very easy to tie and in no time you will have it worked out and be able to do it with your eyes closed.

If your able to jump on the babywearing downunder group on google you can loan some carriers from there. They have a lending database

Maybe once your more confident you can try a wrap. Also a great BW item!