Hey, not the usual type of question but it is still a question that can best be answered by historians so yeah. So I’ve decided to make a career change and am going to college to hopefully end up as a history professor teaching on a college level. What are the steps? What type of schools do you have to go in? What do you specifically have to major in? Etc.
I assume you are starting an undergraduate degree?
The main qualification for becoming a professor teaching history at a university or college level is a PhD in history. This means that following your undergraduate degree (in which you should major in a humanities subject, and at least minor in history of some kind), you will pursue graduate work, usually first a Masters and then a PhD.
Your PhD will involve (probably) classes and then a qualifying year, usually involving a lot of reading an oral exam, a written exam, a proposal of what you want to research and maybe an oral defense of that proposal.
You will then conduct advanced research for 3+ years on a specific subject. This specific subject will lay the groundwork for any future research you do through your career. Often you will be required/find it necessary to do "post-doc" research or teaching--often several years--before you secure a "professor" job. This is not an easy path.
It is also possible to teach history at a community college with a MA in history, where demonstrating research experience is less important. If you want to teach, this is a much faster route and often less frustrating and complicated.
I really suggest you read a little more about these steps so you know a little more about them.