[krogothwolf]

Grid based will be probably difficult for forum use. The only way that would work is if you keep an updated picture active with the locations of the characters and have them tell you what grid section they move to.

The best bet is have it like DnD, have a Grid of 5'x5' for yourself and track the movement based on the characters having a movement speed of feet.

Not sure what to use for tracking that would work, but we use Excel if we have to leave without finish combat to record where everyone was during the combat. There might be better things out there, but Excel's easy enough as you can easily edit and change the sections of the 'grid'.

As for setting it up, just create a sign up thread and have people create their characters.