After the first crazy couple of weeks, use washable breast pads as they're so much cheaper. I have 12 Avent washable ones that have seen me through 4.5 years of BFing!!
For labour and immediately post birth it's useful to have some disposable incontinence pants (not for wee - for amniotic fluid during labour, then for blood and lochia post birth). A couple of packets of Boots own brand did the trick. I wish I knew about these before the birth of my first, I spent 10hrs labouring at home after my waters had broken and dripped wherever I went.
For the first few months it's nice to use a changing mat liner for baby so they don't get a cold back on plastic changing mat, small hand towels work fine but I got some terry nappies for this in the end as I seemed to get through so many of them, I soon ran out of towels, they invariably get weed/pooed on.
Also in this cold weather, tights are good for boys as well as girls, babies seem unable to keep socks on.
Also the advice above about ignoring advice is great, please fee free to dismiss any or all of the above, and just muddle along in your own way!
good luck!