We found that we could have basically skipped half clothes sizes in the first year (i.e. just got 0-3 & 6-9 & then on to 12-18, missing out NB, 3-6 & 9-12) as DD grew out of them so quickly - she was in 12-18 size by 9 months! (luckily we had borrowed loads of stuff from friends so it didn't matter)
Borrow all you can from friends, especially in the first year they will only wear things a handful of times before they are outgrown. We borrowed loads, it had already been through our friends 2 DDs & by the time we handed it back after our DD had used it, it still looked brand new....
If people are going to be buying presents for baby drop strong hints for them to buy in big sizes (at least 6-9) - they really don't get any wear out of the deluge of NB & 0-3 clothes you will receive.
Wait to see how you are before buying a sling - I had SPD & couldn't use mine, too painful (a friend had a similar problem with a dodgy back)
Ebay is great for bargains - keep a look out for some of the big sellers offering catalogue returns - we got DDs cot for £40, when it was £150 in mothercare (you could still see the name through where they had blocked it out with black marker on the label - it wasn't advertised at mothercare, but I knew it was from the picture as it was the one I had my heart set on...) It was brand new & it looked like only one piece of it had even been out the box as it was still wrapped up, I guess someone didn't like the wood colour!
Save your money for the things that matter, a new car seat (if you need one) a decent pushchair (some of the cheaper ones can be false economy as they don't last) and a new cot mattress.