As you are an MBA graduate , you have master degree so you can directly get the admission in executive(Stage 2) course of the CS program.

You can enroll for the program online from the official website of the ICSI.

Admission dates for Executive Programme:

28th February for December Exams in the same
year
31st August for June Exam next year

Duration of course is around:
2.5 years (minimum )for Graduates and post graduates.

As you want to join the Course after passing the master degree course you has to undergo two stages of the Company Secretary course:

Executive Programme
Professional Programme

There are 6 papers divided into 2 Modules in CS Executive Programme

Module I

General and Commercial Laws
Company Accounts, Cost and Management Accounting
Tax Laws

Module II

Company Law
Economic and Labour Laws
Securities Laws and Compliances