Search this question and most of what comes back is a margin table.
Why the numbers you find do not match your situation
What one mini Nikkei futures contract requires, what the fees are, what the exchange charges. The numbers look precise.
But those numbers describe what the exchange requires before it lets you place an order, not what you need in order to hold on. Most of them are Taiwanese futures specifications as well, which are a different thing again from contracts for difference here in Malaysia.
So you read a number and still feel no clearer. That number is answering a different question from yours.
What you are really asking is: how much do I put in so that I am not knocked flat in the first month?
The answer to that is not an amount. It is the three things below.