MBBS

Dear Ashish,
In order to pursue MBBS in India, you need to score exceptionally well in the entrance exams. Cost of pursuing MBBS is affordable across all government medical colleges in India. MBBS seats are very less and competition is tough.
To pursue MBBS abroad at an affordable cost Russia, Ukraine

The fee for MBBS after clearing NEET will be around 10 LPA.

The top 10 colleges in India for MBBS are mentioned below:
1.All India Institute of Medical Sciences, Delhi
2. Christian Medical College, Vellore
3. Maulana Azad Medical College, New Delhi
4. Armed Forces Medical College, Pune
5. Kasturba Medical College, Manipal
6. Lady Hardinge Medical College, New Delh

It depends on your choice. But you can choose MBBS as it has good scope.

Yes, you can but it is very difficult for international students as most of the universities are only open to domestic students. You must be a medical council of Canada exams.

In USA, you should take pre-medical entrance exam I.e MCAT (Medical Common Admission Test). Likewise, other countries also should take pre-medical entrance exam.

Well that solely depends on your interest, do what you love to do Don't take up anything beyond your desire. All the fields are equally good. All you need is self determination and desire to excel in any field.