How can I file income tax returns for my Earnings over Internet?

I am venu from INDIA. I want some suggestions. I will be earning some money every month over Internet. for the last year I have earned 4 lakhs. Now I want to file Income tax. But I don’t know whom to consult and which form to fill up for filing the tax. Can anybody suggest me the answer of what form to file the tax ? or Is there any tax rules for earning money over Internet.