I have not been able to fiand anything about this. maybe i am looking in the wrong place.

I am lvl 12 rouge and some of my hits require combo points. Sometimes the hit works and sometimes it does not. How do i get them and how do i know how many i have?

On some potions and things, i see something at the bottom that says Exchange(1). What does than mean?

Also, how do you change your talants, or proffesions?

Thanks...