MBA in USA

Work experience would give you an advantage for getting admission in the premier institutes and get scholarship.

Yes you can but an MBA from a decent University would require 2-3 years of work experience. You can look for an M.Sc. Instead in the field you're looking for.

Yes, you would be able to take up the CPA exam, as your Bachelors programme along with your Masters would provide you with enough credits to appear for the CPA exams. You should comfortably get your license as well.

Yes, GRE is accepted for MBA in USA.

Hello,
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Requirements are:
A four-year Bachelor's degree from an accredited US institution or its international equivalent.
A minimum of two-three years of work experience, depending on your responsibilities.
Resume
Personal Statement
Two letters of professional recommendation.
Proof of English proficiency (TOEFL is the most common requirement- minimum scores: paper-based: 550-=600 and computer-based 213-250).
GMAT score of over 600 (probably the most important thing).

You can do MS from USA from some renowned college. This will give a new and bright direction to your career.