When you say "
what pieces they engage/not engage with," I'm guessing you mean emails and landing pages. To make this easier, I would put the emails and landing pages the campaign uses inside the same program. You can then set up one of each of the
Landing Page Performance and
Email Performance reports that focus within that program.
Within each report, go to the Setup tab, drag in a filter from the right and check the box next to the program:
This will make it so that you report on all the assets in that program of the type the report is for (landing pages or emails).
Narrowing it to leads added to the campaign in the last week is a bit trickier. Since you're pulling them from SFDC, if they're new leads, you can use a
Lead was Created filter in the report's smart list with a date constraint of the last week. Otherwise, if you change some lead field when they are added to the campaign, you can use a
Data Value Changed filter to accomplish this. Whatever you end up using, create it as a smart list outside you report to get the total added to the campaign and then use the report to assess the numbers of those that engaged with the various assets.