Buy CoH & pay monthly fee - get access to CoH content (8char slots per server).
Buy CoV & pay monthly fee - get access to CoV content (8char slots per server).
Buy both & pay only one set of monthly get access to both CoV and CoH content (12 char slots per server).
There are probably more aussies playing villains than there are aussies playing heroes at the moment. Everyone is pretty casual. Good thing about CoV/CoH is the side-kick system. Which allows you to have a team with a pretty large level spread and still have fun. (I wouldn't call a lvl60highbie runninng a lvl20 through an instance fun)
The sidekick system temporarily bumps the sidekick up to a level one less of the master. i.e At lvl40 I can sidekick say a lvl15 to lvl39. So the lowbie at lvl15 acts as though he's at lvl39 (but he's still without anypowers he might learn between levels 16-39) There are a couple of limitiations but they won't make snese me mentioning them here until you've played the game for a couple of hours.
Also to note is that you get a travel power at a much lower level than WoW - level 14.
If you decide to join - there is a healthy Aussie contingent on Justice server. When you join - first thing to do is join the "Australia" chat channel.
The aussie group to be in as a hero is probably "Trashgallery" they are more active than our group "Defenders of the Southern Cross". If you join as a villain the group to be in is SINISTER. Reps for either group are practically always on the Australia channel.
There also exists an app to assist building your hero/villain:
CoV - Soundspeed (Son/Kin Cor)
CoH - Ms Taken (Storm/NRG Def) GoldenRock (Rock/Rock Tank)
WoW - Omikron (Druid) KappaOmikron (Shaman)