Search Result Page
When you enter a search into the search box, the Search Result page is what you’ll get, this page will contain the search result (if any). Modify the options of this page here.
Select your preferred layout for the search result page, would you like a right, left or no sidebar at all?
Once you’ve decided where you want to show a sidebar (if any) Select which one to show.
The drop down menu will list all of your Sidebars, you simply choose one. Feel free to create a sidebar specially for the search results page.
Posts per Page
Now select the number of posts to show per page, If the search resulted in 20 posts or so, set how many you want to show per page.
Set the order in which the selected posts appear in, this order is applied according to the publish date of these posts.