Distance

According to your profile, you need to join Executive MBA. Because you have 6 years of experience and it will help you to enhance your knowledge and also help you to learn leadership skills.

It depends from where you do it. When you talk about entrepreneurship, you should prefer an MBA only after spending 2-3 years job in different sector, preferably in a small firm. That gives you hands on experience of various operations. The next step should be opting MBA or a management programme in entrepreneurship such as MBA social entrepreneurship from NMIMS or MBA entrepreneurship from NMIMS or SP Jain.

You can consider IGNOU University.

After B.Sc Nursing, there are many options available to build a career in your desired field. You may go for courses such as :
-General Nursing Program
-General Nursing & Midwifery
-Hospital Nursing
-Military Nursing
-Pediatric Nursing
-Orthopedic Nursing
-Psychiatric Nursing
You may even go for M.Sc nursing, MBA or MPH (Public Health).
Choose the course on the basis of your interest and skills as it will help you to achieve your long term career goal.

You may refer to the following article for all the information on MBA through distance learning:
https://www.shiksha.com/mba/articles/top-10-institutes-for-distance-correspondence-mba-blogId-6301.