April 15th
is the dead line. After this date there is a penalty. Procedure and forms depend on many factors - are you married, is your wife in US, do you have dependants in US, how lond have you been in US etc. You should read a lot of publications to choose the right form (1040, 1040-EZ etc). If you file joint return and your wife is on H-4 she will need ITIN, which is issued by IRS in 4-6 weeks. And on... I think you are a little late but depends on your case. Hurry up !!!
Good luck