The definition of foreplay is the sexual activity before having 'full sex'. It is not just 4 things you do before you go all the way! Foreplay can also happen without going all the way and can be a good way for you to explore each other's bodies and to learn the things you do and don't enjoy.
Foreplay should include the stimulus of all of your senses – touch, taste, hearing, sight and smell. Telling someone how sexy or lovely they look will help them become sexually aroused. Talking about the sort of touching you enjoy is a great way to find out how to please someone sexually.