When I create document I need to separate them into appropriate folders; however I see no way to create new folders.
What operating system?
Creating folders is the responsibility of the OS, not LibreOffice.
On some systems, in the Save As dialog, there is a button to create a new folder. On other systems, right-click on the file listing area and specify New → Folder.
To move multiple files, it’s easier to use your operating system file browser. However, the Save As dialog can create, delete and move files and folders as well.