Hi Mike, you will need 34" and 38" balusters if you are planning to have two balusters per tread, you can use the 36" and make it three per tread.
No way tell you the cut length and rake because that depends on the tread width and overhang of the nosing. The total rail height is measured from the front of the tread nosing straight up to between 34" and 38", I shoot for 36".
The guardrail heights are normally 36" total rail height but some localities want 39 to 42, better check that locally.
You need a good book to go by, I recommend "Constructing Staircases, Balustrades & Landings" by William P. Spence.
Also print out the IRC stair code 2003 and look at photo 21 for rail heights.
http://www.stairways.org/pdf/2003%20Sta ... SCREEN.pdf