How do you setup an linksys router?

ok so earlier today some stuff fell off of my desk and fell on me too[still trying to figure out how,lol] and i started putting things back and i was moving things about and i dont but something that fell hit my linksys router and the cisco systems light/on was blinking so i did some reaserch and found out that my linksys router had been reset to factory settings.and my warrentee is expired so i need some help setting it back up so i can have wireless internet in my house again.Thankyou all