If you wanted to start and have access to a Mac, I would suggest looking at a combination of Unity + Apple ARKit + an iPhone.
If you are more of a Windows guy, Unity is still a great engine to start with and there are a number of other widely used AR development kits like Vuforia or ARToolKit.
Unity is the basic 3D package which is extended by those dev kits. If you have not done any software development in the past, it will take a bit of a learning curve but it’s by far the easiest tool to use and offers a ton of external plugins that are easily accessible for a single developer (compared to engines like Unreal which are designed more for the workflow of a large studio).