Meditation is precisely what the rosary is. I view the repetition of the prayers, though not without value in themselves, as something of a timing device. They provide a structure to instill discipline in prayer.
When my family gathers for the rosary we usually employ a devotional book that provides subjects for meditation. This evening, we meditated on Judas' betrayal. With our voices united in prayer, and our fingers moving across the beads, our minds contemplated Judas' treachery. We considered how Jesus would rather be scourged by frank enemies than kissed by treacherous friends, how our sins hurt more than the crimes of men who hate Him, how Judas committed two sins, one of betrayal, but the other far graver, that of despair. Realizing what an aweful thing he had done, Judas despaired, and doubted the mercy of God. We also thought about how Judas flung the thirty pieces of silver into the temple, and how we lose God with sin, and lose whatever we prefer to God. And we meditated on how Judas didn't care for Christ's way of reigning on earth. He had listened to Jesus talk about the cross and the blessings of poverty and Judas was disgusted by it. He hanged himself. By refusing the cross he lost eternal happiness.
Deep stuff, but that is where the rosary leads. Into the depths of the gospel.
Why do you need to pray to Mary to meditate? Might not asking the Holy Spirit to lead you to all truth be more appropriate?