What eviction notice should I serve?

[Roger Verastegui]

My father and I bought a foreclosed home recently in Charlotte, NC and it was an REO property. We have been trying to work with the occupants, but their lawyer is very slow to respond which leaves me to believe that they are not very serious about getting a lease agreement signed. I am planning on moving forward with the formal eviction process if their lawyer continues to be flaky, however, I have a question about the Eviction Notice I would serve them. Since we never had a lease agreement with the former owners none of the Eviction Notices apply to our situation. The nonpayment, criminal activity, lease violation or lease termination rules do not apply. I have been searching the internet for a form that suits our situation, but I have not found anything, am I looking for the right form or should I be looking at the Notice to Quit form? Thank you and I appreciate any advice.