How to track users using Google Analytics?

Thank you Duncan, I tried it, and I get it now, I see the URL has many parameters appended, like:

http://example.com/?utm_source=phplist984&utm_medium=email&utm_content=HTML&utm_campaign=Just%20a%20test

But I cannot find the corresponding hit in my Google Analytics. The PHPList help tool tip says to look in “Traffic sources -> Campaigns”, but there isn’t an item in GA that is named exactly like this anymore, might be due to updates of GA.

I see these 3:
Acquisition > All traffic > Source/Medium
Real time > Traffic Sources
Acquisition > Campaigns > All campaigns

But maybe my test hits are being swamped by hits from the public at the moment, I do not see any source like phplist. Do I need to do any set up at my GA?

Is there much database overhead to enabling GA tracking in PHPList?

Is there any downside? Does it worsen spam scoring?

Thank you.