Hi Shruti,
Welcome to group.
I assume that you don't have programming experience.
If so, then I would first suggest to use Selenium Record and Replay tool -
Selenium IDEYou would learn Selenium location strategy about - xpath, css etc But don't get too carried away using it as Selenium IDE does not provide you many features which a full fledged language does.
Following this you should decide the language you want to write your Selenium tests in. And then move on to learning
Selenium 2.0Happy learning. Let us know how it goes.
~ seleniumtests.com