How would you like players to generate ability scores? Point Buy, rolling, elite array, etc.?
Great to hear,Interested.
It's been a long time since I played or run any PbP. I love Planescape but I can't say I'm an expert. My knowledge is especially messed up by having played PS adventures with lots of DM-made ideas, so when think I know something, I can't tell if it's canon or homebrew. But I don't consider this a problem, it may reflect on the PC as their naturally incomplete/incorrect knowledge of a multiverse far too large for anyone to comprehend.
Usually I wait to see what other PCs are designed by the other players before choosing mine, to round-up the team. But I see that you don't mind whatever party composition we end up with. I still prefer not to pick the same class as another PC, unless there are more than two, or those two are strongly differentiated in other ways. So I might wait a bit to see the general outlines of the other PCs before creating mine.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.