Profit division in a start-up

I am totally new to Corporate Law as I am from IT background. 

Suppose we start a Pvt. Ltd. company where the investments are as follows.

1. Investor A - 2 lakhs

2. Investor B - 3 lakhs

3. Bank Loan - 2 lakhs

Now Person A and Person B have not invested any amount but are willing to be the partners in the company and Person A takes responsibility of Customer Support and Person B takes responsibility of Marketting. 

While Investor A just invests the moiney and don't take part in any work. Investor B is the head of operations and deals with all the Technical Domain and operation of the company.

Now my questions are:

1. Will all (4 people) be the directors of the company?

2. Since Investor B has the main role, will he get the max profit share?

3. What will be the profit sharing ratio of the others?

Thanks