Things that i do still today (7.5 months later) but that especially helped me personally in the beginning:
I am a very creative person. So i bought the sims 3 for my laptop and would spend hours building houses. If you like gaming i would suggest any game that you enjoy that can occupy your time. Its a good investment in my opinion because you buy it once then you have hours of entertainment so you save lots of money to cure boredom.
Reading. Particularly a website called quora. If you dont know what that is, its basically a 1000x better version of yahoo answers. I have always been the type to google random things that i dont know the answers to. You can read in depth answers to many different kinds of questions and give answers too. There are also lots of questions and answers on there relating to addiction/drugs/alcohol. They also have a big section on prison/prison life. Which for me was useful as i am on probation for dwi and cant drink and if i do i would have to spend time in jail. Pretty much anything I can read or watch relating to prison or jail to scare myself from drinking. Also there are lots of personal stories you can read on a variety of topics.
Also on another note of reading. Plan a trip to the bookstore or library. There are tons of books out there to explore. My favorite topics are psychology, self improvement, and philosphy, though i would really prefer to get into a good fiction series if i felt the need to “escape”. Sometimes its just fun to browse, pick up a book and skim through it. I have a book in my car but sadly i cant remember what it is called, when i go to work i will edit this answer. Lots of stuff in there i felt related to my journey sobriety.
Cleaning. Personally i like a clean house it just makes me feelw better and it also helps your brain to feel more organized. I need to clean and vacum my car but its just too dang cold!
Cooking. Learn to cook something new. Im not much of a cook but i have made home made cookies and brownies so far. It just gets pricey buying all the little ingredients if you dont normally have a lot of them on hand which is why i havent done a lot.
Other than that. I was mandated to attend outpatient rehab and AA classes for 6 months last year. Though it wasnt the funnest thing in the world it helped a lot. Look for an mhmr near you, the one i went to was income based so i didnt have to pay anything for my outpatient meetings. Even if you end up having to pay just know there are options that wont end up killing your bank account because i had no idea.