You can do spells for essentially anything. Anything you really wish to happen. However, that said, it is best to begin with very small spells. Like, for example, good luck spells to enhance your day or week. Eventually after large amounts of meditation and preparation, you could move onto bigger spells that have more effect. I've found that if you over exert your spiritual energy (which could be very little if you're a beginner), it could lead to consequences, such as, getting ill.