Is there any way possible to manage my files online rather than editing them in Dreamweaver/notepad and submitting the edited files?
You can edit files, move then around, etc throgh telnet / ssh. IT requires some knowledge of commands and the like. Check out the K-base on the subject if that works for you.
If you’re looking for a more GUI way of doing things a CMS might provide you with what you lookign for. Perhaps joomla or Pmachine Pro, or …