judging by your questions, you are gonna need someone with experiance helping with a cam.
plus if you put in a cam that will give you any power, your gonna need a torque convertor.
i suggest if your looking for power adders do some long tubes, a ORY, and a full exhaust with a straight through style muffler like magnaflow/dynomax etc.
a tune will be the best bang for your buck.
depending what type of driving you do, gears will give more power, but will drop highway mileage