MacOS – How to perform cleanup duties on OS X

• Set up Time Machine the first time you start you Mac,
• Set up Software Update so that your system is always up to date.
• A shutdown once in a while should clean most of little garbage but you will have to perform it anyway with some software updates.

and

• Never log in with administrative privileges unless you have a serious reason to do so.

AFAIK Migration Assistant will let you do just what you've asked. Here is an article on this but it's pretty straightforward.