Please help!!!! Completely overwhelmed!!!

Leslie • Married 3 years, ob/GYN nurse, first time mom:) overwhelmed!!!
So I am 18 weeks today! We have nothing done in preparation for her to come! And I have no idea where to start!!!! I am high risk pregnancy so there is a good chance I will be on bed rest if not in hospital and have to deliver early so we don't have that much more time!!! I am freaking out!!!! Please help!!!!! Where do I start where can I find like a like or a guideline to help me register and just basically what to do! Sorry panicky a little!!!!