These settings are within Appearance → Theme Options → Blog
Select the default layout for Blog pages. This includes Index and Archive pages.
Select a sidebar which is relative to the column. Add more sidebars via the Theme Options → General tab
Choose between Normal and Grid format for displaying your Posts.
If the Layout format is set to Grid, choose the number of columns you wish to display the Posts in.
By default this is set to Excerpt Only, to display an Excerpt + Image, set the option here, this setting can be overriden via Posts → Additional → Image in Post / Archive
Display Post Metadata
If you wish to hide categories, dates and other metadata, select the option here.
Post Metadata Align
Choose between displaying the metadata to the left of the post or below the title.