Question for you. Why do you not know things about magick if your mom and grandmom are witches? Just wondering.
You need to start with the basics, which you can find on this site. Meditation, grounding, energy work, etc. With your family being witches, books on the subject should be open to you. Read, study, learn; best advice. You can download pdf format books on magick. The information is out there, and within this site. Another you might try is about.com, putting basics of magick in their search bar. There is a search bar on here too.
So welcome to the site. May you find what you seek. Blessings!