Hi @revanthammineni,
the first thing you could do it's installing Enterprise Security Content Updates (ESCU) from Splunkbase (https://splunkbase.splunk.com/app/3449/) in this way you'll have up around 300 Use Case already available that you can enable if you have the related logs.
In addition I hint to follow the videos on YouTube and eventually to follow a training on ES Admin.
Ciao.
Giuseppe