Get your hands on an owner's manual (available from Ruger for free or eBay for a few bucks) which will have disassembly instructions or buy the Gun Digest Assembly/Disassembly volume for automatic pistols from the Gun Digest website. You can also go to Ruger's website and READ a Manual for the Mark I... http://ruger.com/Firearms/PDF/InstructionManuals/48.pdf
Contact ruger and request a owner's manual
No such weapon. It is either a Mark II pistol or a Redhawk Revolver.
50-225
50-200 USD
You can request a owner's manual at the Ruger website.
50-175 USD
75-260 or so
Which one?...The Mark 1's and Mark 2's are pretty valuable...
The numbers 10-21133 are the serial number that was assigned to your Ruger Standard Mark I pistol,which was made in the year 1969.
Ruger will tell you if you phone customer service.
100-500 or more depending on specifics
50-260 USD