Report Assistance - Conversion Funnel/Marketing Channel

Hello - I am running into a roadblock on a report that I am trying to create and hoped I could get some advice/tips here.  What I am trying to do is:

We are going to have several landing pages that a user will come to from various forms of advertising.  The goal is after the user accesses the site on the landing page - they ultimate complete an enrollment form which has about 8 pages in it.  Once completed they will arrive on a "Thank You" page. 

What I have been trying to do is set up a conversion funnel or a marketing channel overview to track those who enter on one of the landing pages and complete their enrollment by arriving on the "Thank You" page.

Thus far I am not having any luck in accomplishing this. I've created a segment for one of the landing pages and added a "within 1 week" they arrive on the "Thank You" page, but I'm not sure how to use this to generate the report I need.

Thanks for any input or advice.