A few suggestions: Talk to the hame care agency that is closing. They may be able to answer many of your questions or direct you to those who can. Since they are closing you should pose no threat. The worst that can happen is they tell you nothing.
I would contact my board of nursing.
I would also contact my malpractice insurance
company. If you don't carry it you should for this.
I would contact the department of health.
I would go to my local court house and ask about a business license.
I would go to my state, tax franchise board and find out how to get a business tax number.
I would contact the department of labor to find out what you need to do as an employer.
Contact an accountant.
Talk to the podiatrist who is encouraging you.
Give as much information as you can to these people. Ask as many questions as they will tollerate. And ask each one if they know who else may be able to help you.
Good luck with this. I am sure your venture will be sucessful.