Hi
Adjust the brake shoes first. If the brake drums bind, you have over adjusted the brake shoes. Release the adjusters to the point where the brake drums just become free. If you have the ratchet type adjustment whereby you adjust with the drum off, release a couple of notches at a time and offer up the drum on each occasion, as soon as the drum can be spun freely you are good to go. If you have the square headed adjusters on the exterior of the back plate, Lock them one at a time by adjusting them in a downward direction with a brake spanner. Then slowly release them by turning the spanner in the other direction. As soon as the drum just releases, the adjustment is correct. Then adjust the other adjuster in the same way. Once you have adjusted both drums. Check the handbrake, when the handbrake is applied the drums should lock ( as a rule of thumb, six clicks is about right, as you gently pull up the handbrake, count the clicks). When released the drums should unlock. If the drums lock and unlock correctly when the handbrake is applied/released and the handbrake travel is about six clicks. You do not need to make any adjustments to the handbrake. If you need to adjust the handbrake, first start off with the small adjustment which can be made by moving one hole up or down on the handbrake hooked lever. If you have fitted new shoes and handbrake cables the first hole should be ok. If you still have issues you may need to make a larger adjustment from the half moon by removing the clevis pin and slotting it in the first hole.
