Ok now I am getting really confused

Front of check list says Obtain the following documents -------- DO NOT SEND THEM TO THIS OFFICE. One of which is the I864

At the bottom of applicants statement it says

Enclosures

DS-230 Part 1 - which I complete and send back

couple of other forms then

Form I-864, Affidavit of Support and Checklist

So do I send the I-864 back with the Checklist or not

the "enclosures" list is just a list of all the blank forms that the embassy sent you in the packet. you are not suposed to send the i-864 back.

(that's my understanding at least...)