its a shame no one replied but that can be due to the sticked threads guiding you. Any way first of all Meditation, this should be done constantly through out your magickal life, it actually builds your focus which increases your potential power and also your actual ability, it also releases the "seal" on your energy making it easier for you to manipulate energy.
Next step learn to create an energy ball, practice working and feeling energy around you. Note: you should ground,center and balance your powers often for maximum potential. Your energy system does require maintainance from time to time.
when you are actually ready to cast a spell you should try a protection spell. a simple shield to ward off negativity.
As you go along in your practice you will see that you will get stronger as time go by