Sunnyvale is a suburb of San Jose, CA
Your best bet would be to fly into San Francisco
Air India flies from Hyderabad to San Francisco
http://www.airindia.com/
From SFO, you catch the BART train to Millbrae
http://www.bart.gov/stations/map/systemMap.asp
At Millbrae station, you can catch the Caltrain to Sunnyvale
There are two stations there
Sunnyvale 121 W. Evelyn Avenue, Sunnyvale
Lawrence 137 San Zeno Way, Sunnyvale
http://www.caltrain.org/caltrain_stations.html
As for the procedures, you would need a visa from the US Embassy
The nearest consulate appears to be in Mumbai
Here is their website:
http://mumbai.usconsulate.gov/
http://mumbai.usconsulate.gov/visa_services.html