The fact that your post uses complete sentences and words longer than 5 letters indicates you're probably too old to make a career out of being a rider. Most pro's have been riding / racing since before they can walk.
You can be a racer though, and it's a lot of fun as long as you know what you're getting into. The AFM is a great place to race, lots of classes, lots of great riders, and a great family of friends. You can make a 'career' out of racing with the AFM and have a blast. I did it for 7 years and wouldn't trade that time for anything.
The costs can be substantial and are more than just financial. If you want to do well it is a lot of time and effort, and this can put stress on family and other relationships. You'll use up vacation time, etc.
There are potential physical costs as well. I'm an extreme example but you need to go into it knowing you may get hurt, and you may get hurt more than your planned. Really think about that first, esp. if you have a family. Make sure you are fully insured.
If you're ok with all that then do lots of trackdays, learn as much as you can for a year. Once you can run consistently at a pace that puts you midpack with the classes you want to run in then have at it.
Enjoy!