Can't really advise exactly what you'll need! 😬 It depends on the shape of your baby as to how each nappy will fit, so that's tricky.
For a 9lb er id get some sized nappies. Little Lamb One Size pocket nappies are notorious for leaking (they're on the big side so can be hard to get a good fit, especially on little babies like yours). I haven't tried Little Lamb sized nappies personally, but if they do a trial pack of sized nappies, go for that. I do love our little lamb pockets.
Get a wetbag instead of a pail, way way simpler. I personally love the Kangacare wetbags (can get them on Amazon)
Cheeky-wipes - maybe a pack of 25 to start with, we still use with just plain water, can't be bothered faffing With a wipes solution.
Couple of small wetbags for your nappy bag
We didn't bother with liners pre-weaning.
About 3 size 1 Totsbots bamboozles and wraps for nighttime.
Trying to think what else... It really is a voyage of discovery and the key is to ignore the overwhelm and just begin! You'll soon develop favourite nappies and find some tips and tricks that make things simple.
When I started out I bought one Milovia, one Wonderoo, one Totsbots v3, one little lamb and one Charlie banana (all 1 size) and just started and soon found the ones I preferred. Now, some of my least favourites from then are now fitting beautifully and have become favourites.
Also, fill out the questionnaire on the Nappy Lady site and she'll give you a personal recommendation of all the kit you need. I went to her house for a consultation, you can do that if you're local, or go to your local nappy library. The nappy lady did recommend me a pail though, bah! Definitely go for the wet bag option ;)
Hope that post isn't too overwhelming!! Am in a bit of a rush! Don't give in to the overwhelm, just make a start! :)