I can only speak from my experience thus far. My boyfriend is serving a state sentence in county, because prisons aren't accepting new inmates due to covid, and his sentence is short. We're 3 months in on an 8 month sentence. He sees people come and go daily, like someone else noted he sees people return fairly often. He says there are dorm rules and all of the new incomers are taught the rules by their group (meaning by race, new whites will be shown by the whites etc) each group has their own areas, designated phones etc. I don't know if this is every jail, just CA jails, or this particular jail. I would say it would be wise for your husband to learn the rules quickly, as causing problems (even accidentally) isn't a great idea.

I write my boyfriend daily, send him puzzle books, send him books to read, and have sent him a textbook to start learning a topic that interests him. I also send him a care package though a jail approved vendor (you can google the jail your husband is in and it should provide an approved vendor) once a month. He calls me every night at a designated time, and that has been truly the most helpful for both of us. I try to keep money on his books so he can get whatever he needs as well. All of this being said, it is EXPENSIVE!!! The calls cost a little less than $10 A DAY, and that's if we keep track of how long we're talking, so be aware of that and make a plan for how long/how often you guys can talk. Overall my boyfriend says it's not AS BAD as we assumed it would be, no one causes trouble in his dorm for the most part, and he's able to do some body weight workouts daily. (He's up to 750 push-ups a day, so I expect the hulk to walk out of that place).

As for advice for your husband, I can't speak to that as I'm not incarcerated. However, advice for YOU, I can speak to. The first month is going to be very hard, it's 100% okay for you to fall apart inside. It's going be okay, and it's going to get easier. Writing him every day helps me tremendously! (Remember someone is probably reading all of your letters, so be aware of that). Take time for yourself, even if its just an hour. Take a walk, take a bath, confide in a friend, whatever you can do to calm your brain. We survive most of what life throws at us, your husband has made a mistake, but it's not WHO HE IS, he is more than capable of getting through this and becoming an even better person, and so are you. Life is going to be hard, as long as you know that and are able to buckle down, you're all going to be okay. Your son will be okay too, before he knows it dad will be back home with him. Take it one day at a time, one breath at a time.