About select /set layout , this is very simple it’s config each module display on each page , Example :
On layout >> wapper page all module don’t display
On layout >>Content + 1 Col page all right module don’t display
…….
for understand this problem, you can login to administrator , select a module and view Menu Assignment box .
– About the difference between applying a template and doing a quickstart :
Quickstart is package include sample data ,it help you can easy create your site , when you complete install it , it will create a full site .
Template only include theme for site . When install in your site you must config and do more steps ….