too prepared for a baby?

So for the past one or two months, myself and my boyfriend have been trying to conceive. I've signed up to a few online sites who have sent out leaflets on being a new mum and promotions for products, etc (Cow and Gate, Emma's Diary - things like that) but some of my friends have been really negative about this.. saying that I'm being too premature getting all of this advice and information. I just want to be as prepared as I can! I'm excited and I want them to be excited with me but they just bring a downer on the whole situation. Advice?:(