Emma - for the carrycot, look for a pram which has a bassinet which is certified as safe for "overnight" sleeping.
I'm not as far along as you yet, but I have found it really helpful to simply make decisions about what I want to do (or try to do), and to have a look around our (MINISCULE) flat to see where we can get more space. Maybe this is totally the wrong approach, but it's really helped me personally!
Things like:
Deciding if you are going to use cloth nappies or disposables.
Personally I plan to use cloth nappies for as long as possible, due to the cost, and the practicalities. But it's worth making a decision so you can get an order in a few weeks before your due date (amazon = much cheaper for disposables than shops).
Breast feeding
I think even if you are absolutely 100% positive you are going to breast feed, it's worth getting a steriliser, some bottles, and maybe just one batch of formula in case of emergencies, if it doesn't work out, or in case you dp wants to do the feeding or whatever.
Prams
Prams are so insanely complicated that it's worth thinking about what aspects you would prioritise. If you are in a small space, something that folds up well would be good. If you live in a flat with no lift, then something lightweight. If you live in the countryside, then something much sturdier. When you've been to shops and found a model that works for you, then you can go and try and find it second hand online 