I think others may be able to help you but may need a slightly clearer description of the problem. Could you make one post for each question?
Sasi, Here is an example:
http://vimeo.com/112125072 (turn on the HD mode)
For the Helix body itself, you can create it with a Sweep twisting the profile along its axis
Notice you need 2 steps inside the command.
After that, just pattern along the proper curve (in that case, the curve is the tube axis.
In case you have ST7, as you have a complex shape, one way to flatten this is using the new Blank Body command.
But, yeah, as Frank mentions, would be interesting you give more details about what you want.