By the way, Juuf, if you want an edition of the WTC that's good quality for a low price, try the Dover edition, which has both books in one volume. It's available through amazon
new for $10.36 or less, and more expensive editions do not improve much on this one. The best editions are those that don't add a bunch of markings that weren't on the autographs, as it seems yours does.
As for performance practice, typically it's "correct" to treat the piano as if it were a harpsichord, and to use a lot of staccato. But you will find a lot of differing opinions. It's considered bad form by many to use any sort of expressive approach to Bach (dynamic fluctuation, or god forbid rubato), and it's also considered bad form by some to use pedals (fortunately a diminishing opinion - conservative use of pedals in Bach makes the music meld to the piano, imo), but again, you will come across many differing opinions on this.