Well characters should generally be good people. Maybe not hero types but still people willing to do their part to help the world.

That depends on the magical traits you have in mind.

That also depends, on the heresy. There could be many religions in this world that people are free to follow.

All that sounds fine, just keep in mind I'll not only be GM but I will have my own character as well. 

The only thing is this isn't just a quest based RP. There should be a story and a plot we follow adventuring around. I didn't mean being part of a guild like a bounty board. More like the quests they take send them out on long journeys, sometimes to the end of the continent. So if only one group is doing a quest then only one group gets to be part of that bit of the story. It doesn't seem fair to switch back and forth who can and can't be part of certain parts of the RP. In this way. People would miss half the story. Even with a recap of the quest, half the group still wasn't there and didn't take part in it.

What we could do... Is have two separate threads. One for each group, and they will each have their own story to follow. Could follow your idea here in that each group follows their main story through PMs while activities that involve everyone are based in the thread. Then the groups would be kept separate from one another, if that's what you meant.