Just ordered a set of springs for my 2002WRX, I know that I need to get suspension alignment/geometry checked afterwards but do I need to fit camber adjustment bolts to allow sufficient adjustment after it's lowered. If so will I need front and rear ?

For the small money you will spend i would certainly put a set in the rear and the front. The alignment will be easier to get the best setting. A good technician would fit them only if he needs to to get things right.