First you should know about the BA roles and his resposibilty
The business analyst work closely with customers to understand their business model, requirements and translate them into software requirements document. Specifically, the responsibilities would include:
Assisting with the business case.
Gathering the requirements.
Analysis and Documentation
Implementation
Development
Processing the change request.
You can join any Business analysis training program which is approved from 'IIBA, International Institute of Business Analysis
The course should be evaluated and approved by IIBA, so you get both training as well as valid certification. Business analysis course is based on Business Analysis Body of Knowledge (BABOK Guide) version 2.0 which involves theory, practical, case study, project and assignments.
After getting an experiance of 3-4 year as Business analysis you can go for the certification of CCBA OR CBAP.
Regards,
Manish Singh
ANISAN Technologies