I would start with training for the CompTIA A+ certification exam.Professor Messer
has free video training to cover all aspects of the A+ (and Network+) exams.
Even though I had already used computers for years and didn't even have to study to pass the exam, it was the first certification I obtained after dropping out of engineering school, and with that one certification I was hired for an entry-level technical support position 3 years ago. I was recently promoted to manager.
After A+, I would recommend Network+ if it interests you.
The problem you may run into is that many employers are still looking out for only formal education degrees or previous experience, even for entry level IT. It's like they completely ignore the certifications. Even so, getting one is better than nothing.