You can request a owner's manual at the Ruger website.
10-200 USD or so
Depending on condition, 50-175 USD.
around 200$ higher depending what condition its in
50-150 USD or so
$100-$300, depending on exact model and condition
You can get a manual for free at Ruger's web site.
Semi-automatic, chambered in 22 Long Rifle. The 14-xxxxx means that your pistol was made in 1978 just like mine.
Upload a photo of it to a gun forum to identify it, guns are not identified by their serial number, they are identified by their model name. For example : Ruger Charger, Ruger Mark, etc.
Go to the Ruger website. There is a section to date your 22 by serial number.
Is it a revolver or semi-auto? You can go to Ruger's website to look up the serial number.
Ruger has sn data on their web site. 100-375 USD