I am software engineer with 8 yrs. experience how do I get a H1B sponsorship since I have B1 visa valid up to 2017?

You have to get a job offer from a US employer and then the employer will petition for your H-1B visa if they are interested in hiring you. Since you have a visa to enter the US, you can come and visit different places and set up interviews with potential employers. You can do a lot of that before you come to the US so that you have an itinerary with plans to interview once you are here.

All you need do is get a U.S. employer to hire you and then process your H-1B visa through their company. Upon acceptance and entry to the U.S. you will receive an I-94 card with current dates of legal status into the U.S.

You will need to find a US employer that will file a H-1B visa petition for you. Check the Internet or employment agencies.