First time mum nerves!

Susie • 24,fianceé,mama.💍👶🏼 16-11-16 Arlo 💙 13-04-18 Ezra 💙
I've realised that a lot of pregnancy related things are entirely out of my control,getting this far into a pregnancy,the only thing that's in my hands is all the decorating and buying our boy all the things he will need to have a lovely happy life! 
However,when it comes to after he is born in so scared about what I need to do,if I breastfeed how do I know he is getting enough? Do I feed him on demand? Will I be comfortable feeding him outside my home? Will he get enough sleep? This is just a few things that I'm worrying about like crazy at the moment :( any tips and tricks will be appreciated :)