Hello suhy2, welcome! That is a really nice set.
The BeoMaster 6500 does not have a hinged flap, the only controls are the bottom corners of the front panel. You will need a remote to do any settings (MCP 6500) and for daily control (here a Beo4 or BeoLink 1000 will work too). The BeoMaster 6500 is on standby when only a red dot is displayed. To get manuals, I would advise to become a Silver or Gold member of Beoworld. You will then have access to many (service) manuals.
Regards, Johan