Hi Hope,
How did you send your newsletter out from Marketo? Standard batch campaign? Email Program? Was it in an Engagement Program? There are several ways to pull email stats depending on how it was sent.
One basic thing you can do, regardless of the above, is to simply create a smart list and filter for things like:
"Was sent email xxx" + "Opened email xxx"
"Was sent email xxx" + "Clicked link is any in email xxx" -- etc.