well the rule of three is a Wiccan concept [aka the Threefold Law] which states what you put out will return three times over [how is a matter of interpretation, i personally go with effecting your mind, body and spirit, but many view it as extreme karma] not all witches follow this rule so if you don't it won't effect you. but if you do believe in it, ask yourself if what you are doing is helpful or harmful and that should give you your answer.
not sure what 'VC' means, but again, most things with magick is up for personal interpretation. many view midnight to be the perfect time for spell work [others go with 3 AM or twilight. some even cast by the planetary hours it really doesn't matter so long as it works for you] i suggest since Samhain [aka Halloween] is a ways away i would take this time to practice 'the basics' of spell casting so you are better prepared for the spell.