So you want simple shortcuts.
First of all, if you use buttons shortcut availability is default. Simply put an amp in the text:
Button1.Text = "&Ok";
, and you have Alt+O as shortcut (but you don't want this for some reason). With menus, you have even more possibilities, see here: http://msdn.microsoft.com/en-us/library/system.windows.forms.menuitem.shortcut(v=vs.110).aspx
]. If you want to have more general approach to be able to add custom shortcuts to custom actions, you can have a look here: http://snipplr.com/view/57156/