nurbs curve newbie problem

OK so I have 4 control points and I want to make a nurbs curve that connects them.

I connect them in into a nurbs curve component... and I play with "graft", "flatten" and "simplify" features on all four points.

Either I get a faceted curve (even if the Degree is 3), or I get a partial curve (one or more spans missing) or I get a squiggly mess.

I presume, since I have dashed connectors on 3 of my points, that I am dealing not with 4 points but with many, and GH doesn't understand how I want them to be used.

I think am missing GH concepts concerning "data trees", and reading tuts isnt helping lol

Can anyone help me get a simple, smooth curve?