B.Com

Never do an MBA with salary in mind. You will definitely end up disappointed.

Definitely, you can. The previous performance isn't considered to judge you but you need to work hard to get a better result even if it is CMA, ACCA, CA, CS, or anything, you can do it.

To complete your studies from Canada, you can go for online class like CMA (US), which can be completed within short period of time itself because than MBA, CMA (US) has more scope. For MBA, the fee is Rs.5 lakhs to Rs.6 lakhs, but for CMA it is lesser.

After B.Com, you can prefer some professional course like CMA (US), which is related to finance, so you can get more knowledge and it can be completed within 8 months to 1 year and it has better scope all over the world.

Yes, you can change your university in the 2nd year, but here comes a condition that the college in which you want to go allows lateral admission or not and some colleges and universities have some prior benchmarks that you need to achieve before taking lateral admission. I would refer that, first check it with the university that they allow lateral admissions or not and what all are their benchmarks.

Yes, this is a good option as many people are not able to cope up with both of the courses. It becomes slightly difficult to attend classes of both at the same time. In CA, you will cover every bit of financial sector and that would help you in near future while giving the final exams.

You can apply to the following universities:
WCU in USA
Brunel University, London
Keele University, UK
Ball State University, USA

Hi,
Here is the link for complete information regarding MS in Entrepreneurship : http://www.masterstudies.com/Masters-Degree/Entrepreneurship/
Hope this helps ! :)