I used a mixture of Diddy Diapers and xs Motherease Sandies under xs motherease wraps, or cotton bottoms (don;t think you can get them anymore though)
I found they worked well for us (my girls were 6lb 5oz and 5lb 7oz at birth)
The diddy diapers aren't the prettiest nappies around but they did the job and you can pick up preloved ones very reasonably
I had a couple of xs fuzzi binz but in all honesty I'm not a fan of pockets on newborns (they never seemed to contain the poo very well
), also not a fan of onesize nappies so can't help there sorry!
I can recommend getting your hands on some terry squares, I had about 20 bamboo terry squares and used them a lot, some as nappies inside the wraps when newborns, some as burp cloths, then as they got older I used them as additional boosters in night nappies or inside pocket nappies.