Meditate on the white tara with this: OM TARE TUTARE TURE MAMA, AYUH PUNYA GYANA PUSHTIM KURU SVAHA. This is a very powerful mantra and Tara, who is the wellwisher of all, will be happy and give you whatever you desire in this life. However, you have to realize that the White tara that this mantra invokes, is a compassionate being for all. She will not comply if you ask her for selfish desires. For instance, if you ask for alot of money, she won't give it to you if it hurts another individual in the process. However, you ask her for compassion, love, detachment, abilities to heal other people, ability to solve other's problems, wisdom... she will grant you these wishes.
Easy, chant Her mantra - Om Tare Tutare Ture Soha. That's it. That's also a very special instruction. As it's simple.