http://www.stanleyhardware.com/default.asp?TYPE=CATEGORY&CATEGORY=HDW+HANDRAIL+BRACKET
those are the brackets.then just get some handrail stock at home depot the length you need.
then find out the height it should be
i think it’s 32″ above the step but i always just set it at a comfortable grab height.
brackets must be solid into studs or anchored if into brick.
not hard to do at all(if i can do it)