This is my first pregnancy too and I know where you are coming from.
The way I am approaching this experience is by not looking too far in advance.
I didn't need to think about the nursery and baby stuff until I got through the first 12 weeks and saw the bean in my scan, so until then I looked into managin nausea, eating healthily, vitamin supplements, how the baby develops, and having fun keeping our little secret.
My dp and I have briefly talked about maternity leave before, but now our 20 week scan is this Thursday (excited and nervous) we will discuss more about our options so I dan tell work. There is no point in overloading your brain, but it is quite fun finding stuff out over the full term. So don't panic on the overload.
I also have a couple of apps that track my pregnancy and I make sure I don't make a habit of looking too far ahead. It makes it feels a little bit like Christmas each day, which also happens to be when I am due :)
Find out what you want and need to know, and make your own decisions. Eg, finding out the sex, we decided (last week) not to find out the sex, but that is our choice. Others want to know, and that is their choice.
Also, when I found out, we decided to tell noone, except my best friend because I needed to have a confidante who has been there and got the tee-shirt to just run things by her. Then I discovered this forum, which has been brilliant.
Just enjoy.