Hi mash - no the selection order doesn't make any difference - the Network command will analyze how the curves touch each other and form the proper ordering from that information.

But you do need to have a structure that will work with Network - it needs to be able to be unwrapped to a 2D grid pattern.

See this recent post for several links to examples of how you need to have the input curves arranged:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4448.4

- Michael