The average salary will depend on a few factors but you can use the website glassdoor.com to do some research depending on what options you have in mind and specifically which medical field.
For example here is information about a registered nurse in Massachusetts on average.
Depending on what specific job title you'll have in the medical field (nurse, biomedical engineering, etc.) there is different information. However those could be searched on the same website as well.
Also you could take at some specific online job boards to get a sense of what types of jobs there are in say Massachusetts, and what their salaries and job responsibilities are. Personally I like indeed.com
Here's an example search of also registered nurse, full time in Massachusetts for Entry level positions. Take a look around the two websites, matching what your plans are for your future.