My method -
Cotton wool balls, water and kiwi black.
Soak the cotton wool ball in water, drain excess, apply small amount of polish and apply it using small circular motions equally over the shoe.
Repeat over and over again until your shoes begin to build layers and shine.
This is my method. There are literally hundreds. Find what is best for you. My uncle is ex army and he showed me a spit and shine method, which baffled me!