For the first year (or two), prune very lightly. Clip off dead wood when it occurs. Cut the blooms at the juncture of the first or second five-leaflet leaf next to the bloom.
After it's established in a couple of years (one year if you really feed it and have excellent growing conditions), you can safely harvest a bloom at the 2nd or 3rd (I'm prudent) five-leaflet leaf from the bottom of the bloom's cane. ML will put out glorious single blooms on 3 ft stems. Cut them as soon as you see the sepals turn down. The blooms will dependably open in the vase. They tend to pop open very fast, otherwise.
Q