It's hard to know what help you need if you don't show what you have done or what you do know about this. Do you knowhowto find the tangent vector? Do you know how to find the equation of a plane perpendicular to a line? Do you know a formula for arclength?

As for the graph note that is a circle in the xy- plane. That means the curve is directly above that circle while z increases. What figure is that?