You can go for filing an RTI at any point in time whenever he wants to seek any information regarding any government organization , or its any ongoing program, any public authority, etc.

First of all, one should identify what information he needs to know. 

Try to seek information as which public authority (department of the government, public sector enterprise, NGO, etc.) has the related information. 

After this, send the application to the concerned Public Information Officer/ Assistant Public Information Officer.

Next step is to simply write / type one’s question on a sheet of plain paper ( Some states have their own rules, so better stick with the prescribed form) with the PIO/APIO(Sec 6(1)).

After this one has to submit the application with the application fees (if necessary ) to the PIO. 

1. For Central Government Department: By Indian Postal Order (IPO) of Rs 10/-favoring the Account Officer of the D Department.
2. For State Government Department:By Indian Postal Order (IPO) of Rs 10/- favouring the Account Officer of the Department or 10 rupees non-judicial court fee stamp.