I'm a single dad plus work so I didn't do much extra. On my resume I have that I started my own web development company but I don't really have a portfolio.
Props on being a responsible father. As you know IT is far reaching. So, if you didn't do so during school, find out what field you want to specialize in. Find something that will keep your interest.
I did web design for quite a few years, but with the rise of Wordpress and other CMS systems, it was cheaper for people to go that route. Here are a few avenues to explore:
Network security
Help Desk / Customer Service
Project Management (I'm putting this on the list, but don't do this until you are well versed in IT)
System Admin (Windows or Linux)
AWS / Azure
Communications
Patch Management
Vulnerability Management
Identity Managment
Active Directory
...as you can see the list can go on forever. As a rule, getting your Security+ cert is a good first step.
Let me know if you need a book on a topic, I'll see if I can get it for you.