If you are really serious about having a career as an ultrasound tech, then you have to first earn for it. You have to finish a bachelor's degree or an associate degree for you to qualify and work as an ultrasound tech. And this should not be just any degree. It should have the subject of ultrasound as a major topic. This subject is formally called the diagnostic medical sonography.
This is very important because the role and work of an ultrasound tech or a sonographer revolves around the use of the ultrasound machine. But if you are worried that you will not be able to enroll in schools and study for the job, then do not worry. There are different ways of earning this degree. There are lots of ultrasound tech programs you can look into, and there is also the convenient way of applying for this program online.