Club Fitting
I think Nike Driver Sumo2 is little too lite, not much hand feel, it should be fit into a heavier shaft, this lead me to talk about the weight and flex of the shaft.
The specs on the shaft you will see are the weight, shaft flex and kick point. they all are important, the most common things you'll see for weights are 55 grams 65 and some 75 out there. For the flex are regular, stiff, extra stiff, and some senior/lady flex. Another spec are kick poing, low-kick, mid-kick and high kick. How to find a right shaft is not depend on the shaft only, you have to combine with the shaft flex and the head. Most Amateur will think the more professional or harder club they use, the ball will go further or better, all those spec are need to be fit by a professional club fitter, it determine by your club head speed, your contact of the ball and ball speed etc.. So don't just think of the brand or the look by the club, it should be how you feel about the club, and get professional advance (not the sales, because they might be lack of knowledge) And also check your lie angle for your iron, because they all standard mean might not be fit for you!