The main thing to consider when deciding on a type of nock is whether you want a raised indicator or not. An indicator is a raised bump on the outside of the nock which is aligned with the indicator feather and allows for arrows to be quickly drawn from a quiver and aligned properly. Often times, nocks with this indicator are called speed nocks. When attaching the nock to the shaft, make sure the slit of the nock is aligned perpendicular to the grain of the wood, so the force of the bowstring does not split the wood.
You will also need to choose a point type. For SCA target shooting, you will need glue on steel field points, which generally come in two different weights, 100 or 125 grain. A heavier tip will increase penetration but will also increase the overall weight of the arrow and slow it down.