Setup articles are only required reading for the DM.
By far the easiest option regarding setup is the use of an online service that provides PlanarAlly to you and your players.
At this point in time I do not have the resources to publicly host a PlanarAlly server, but this might be something I would like to add further down the road.
Important to know is that these services are not operated by me and thus I cannot guarantee that the software has not been altered with malicious intentions.
If you host or know someone who hosts PA publicly, feel free to let me know!