Moving qigong is much easier to practice than form.
The coordination is simpler and the health benefits more immediate and tangible. Form takes much longer to learn and quite a long time to actually perform competently.
Anyone can do qigong. There is a lot less to think about. The exercises are focussed and clear. You need not complicate matters by thinking about self defence applications or any other concerns.
It is also important not to get caught up thinking about qi. Let the energy take care of itself. Keep your mind on the exercise. Intention leads the qi and the qi leads the blood. Breathe and relax.
Once you are competent at qigong, take what you have learned into form. Form is essentially moving qigong with extra features. The extras include increased balance and coordination, martial application and energy emission.