To develop a calm mind, I recommend practicing mindfulness meditation. This is where you focus on one thing like the air coming in and out of your nose for 10-45mins per day. You can do this sitting, laying or even walking.
2. Know where to Receive Intuitive Messages
Heart/chest is where you feel your intuition.
Head/brain is where you hear and see your intuition.
3. Pursue your Passions, hobbies and interests.
This is your intuition speaking to you. Pursue them. If you invest enough time and energy into them one day you could make a career from them and it will become your purpose.
