Use RemoteFileInfo.LastWriteTime:
https://winscp.net/eng/docs/library_remotefileinfo

I would really appreciate if you take a look at documentation yourself. I believe this information is easy to find.

Is there a way to look at the file properties and choose a file based on it's edit or created date?

Use Session.ListDirectory:
https://winscp.net/eng/docs/library_session_listdirectory

But possibly you could use Session.SynchronizeDirectories directly
https://winscp.net/eng/docs/library_session_synchronizedirectories

I am trying to synchronize the remote directory with a directory that is on my desktop locally. The thing is, I do not know what the name of the files on the remote directory will be so how do you retrieve all the file names in the remote directory before I synchronize the remote directory files with the local directory files?