Advice about custody?

Hi guys, I currently live in Washington state. I’ve been told by my attorney I’ll be sentenced around 17 months in custody and it’s between county jail(Pierce) or state prison. I’m honestly very nervous about being away from loved ones and family but I’ve been told prison is the better alternative than jail.. if there’s anyone from here that can share what to expect in prison how it all works what to stay on top and and how to utilize resource in prison or jail would be much appreciated.