Ok, have fixed the problems mentioned. Not sure how all that got so confuseled.

Anyhow, it's kind of confusingly worded.
Which part in particular?

One thing I wanna ask: There's nothing about this class that requires spellcasting to get in. What do you do with those arcane spell levels if you come in from pure rogue?
Like most PrC's, nothing really. This is why it is probably best if you multiclass with bard at least for a single level.