You speak of the following rule:
Multiple creatures can attempt to grapple one target. The creature that first initiates the grapple is the only one that makes a check, with a +2 bonus for each creature that assists in the grapple (using the Aid Another action). Multiple creatures can also assist another creature in breaking free from a grapple, with each creature that assists (using the Aid Another action) granting a +2 bonus on the grappled creature's combat maneuver check.
If more then one creature wants to grapple a foe an none has does the first creature to go declare grapple or aid another as there action?
I would think the aiding creatures go first followed by the single grapple attempt.
Can you aid a grapple an not be grappled?
It looks like aiding does not give you the grappled condition. Though I would tempted to rule otherwise depending on circumstances.
On maintaining a grapple can more then one effect happen if there is more then one creature?
One grappler. One "effect" per actual grapple check.
Do armor spikes damage only when you chose that as you effect in a grapple?
Yes. Its effectively like attacking with a light weapon but its always drawn.
When move a creature does if follow my exact path?
GM discretion. But you only get to place them in harms way at the end of the move and then they get a free grapple attempt to break free.
Can you force it across a wall of fire more then once in move?
Not unless you also move through the wall of fire. See above.
How does the final repositioning at the end of a move work in terms of path chose?
See above.
How must aiders move when a grapple moves?
In their turn they must walk over and do an aid action if they want to continue aiding.
Any way using multiple grapplers to achieve pin in one round?
No.