Many people will tell you there is no such thing as white witch or black witch, witch is witch. But you are asking for the labeled white, which is symbolized as 'good' magick. Most people who practice this 'white' magic, do it following rules, some follow the harm none, do what you will. And the law of three, that says everything you do will return threefold.
That being said, every white spell is done with good intentions, that is why many argue that love spells are not included, for they manipulate other's will, and is a major nono,white.
You will need to study basics (no matter what color of magic you wish to follow, they all start with basics), and depending on the types of spells, you will need different materials.