Start by standing in a comfortable distance from a wall or your partner and place your fist on him/it. Now as your body is aligned and comfortable do a one arm push up on the support and place your other hand on the support. Do push ups as you go around the support and work so the wrist is relaxed as possible and the movement come from the elbow first and than from the shoulder. Have the partner do the same for you or hold onto a door frame or a tree or some support and lean away from it in the same manner. Notice to the support you have to introduce in order to stay aligned and lead it to the sky or to ground in order to allow it to move through you without harm.
Progress to someone walking towards you and you placing your fist on him and redirecting him. Notice how you lift your hand and remember to let the breathe lead you when possible. It is good to do some work without breathing so the body will know it is possible.
Move to hitting your partner as he moves away with the body aligned as much as he can and placing his hand on you and either pushing or pulling (think how the bodies move and how you can stay moving) Do this for a while and than do a few push ups and sit ups to relax.
Now have a partner hit you and you move with the body to let the strike slide next to you and add one arm to press the arm to you or just using the arm. Avoid moving too fast out of fear. Relax and remember to survive first. Use only one hand for a while as your partner uses both arms and learn to move from difficult situations. Your partner will learn to strike from all situations.
After you do this for a while and so has your partner join the drills and have him strike and you capture the arm with one hand and place and either push or pull with the other. You can also hit with the one arm and don’t limit yourself to the common strikes. You can for example slide the coming arm overhead and continue the level with the opposite shoulder and lower your hand open to the neck or groin of your partner. Find your way.
Do this also while sitting and on one knee.