What MRBB said find I trail from the field source and walk it back until you either run into deer or start finding beds which are essentially ovals of matted leaves, grass etc... where a deer was bedded down.
Dont discount the private land. Hunt that if you have a chance it takes skill to get a deer private or public dont sell yourself short. If I had access to private land I would spend my time hunting that over private land because the private land probably has a few more deer with less pressure and you chances for success will increase as well.