Regarding itr

You can file ITR-4s.

sir whats the difference between 4 and 4s?

ITR-4s can be filed where no books of accounts are being maintained and income is declared atleast at 8% of the gross receipts. ITR-4 can be filed where books of accounts are being maintained.

and one more question sir.
can i fill my tax online on my own?
and the process and steps are easy or difficult to file itr?
and how much of tax i have to pay if my total earning is 5 lacs per annum ..and i am saving 2,85,000 in life insurance policies

Yes you can file your return online on your own. But I would suggest to take help of a professional especially if you are filling it for the first time. I suppose the income details you mentioned, are for financial year 2014-15. You might have to pay some interest. If these details are for financial year 2015-16, then you have to wait for atleast April 2016, when the e-forms will be released by income tax department.

can i fill itr for FY 2013-2014 now?

Yes you can file ITR for financial year 2013-14.