Search Service application - SharePoint 2010

Create a Service account with Domain user and DBO permission.
Register this account in managed accounts through CA.
Create new search service application --> CA --> Manage service application --> New --> Search service application --> Enter the name of service application --> Select the service account for this application --> Select new or existing application pool --> OK

Click on Search administration , verify the default content access account and enter the Contact email address, Content sources.

By default the service account selected while creating search application is the default content access account. You can change the default content access account through below step:
Search administration --> System status -->  Click on the account which is just right side of that default content access account.
In the same way change/enter the contact email address.

Create content source --> Click on content source in search administration --> New Content --> Select the content source type --> Add the URL  --> Define the Crawl schedule incremental/full -->ok

To get the people search:
Just add the default content service account permission as "Retrieve people data for search crawl" at User profile service application. Here are the steps:
User profile service application --> Administrator --> add  default content service account permission as "Retrieve people data for search crawlers"
Provide FULL Read permission to this account at all the required web applications.

If you don't have basic search page then create it now, here are the steps:
Browse the top level site --> Site actions --> New Site --> Select "Enterprise Search Center"  --> Enter the name and URL --> Ok

Create Enterprise search page --> Central Administration / Application Management / Site Collections, click on Create site collections.   Ensure you are creating the Site Collection below the relevant Web Application. Enter your Title, Description etc and select the Enterprise Tab under Template selection.  Select the Enterprise Search Center, specify your site collection administrators and click OK.