I find looking at pictures that correspond to each mystery of the Rosary helps me a lot. I am lucky enough to live in London and I went to the National Gallery and bought postcards of paintings depicting each of the mysteries. For example, for the Annunciation I bought a postcard of Crivelli’s Annunciation. You could google for images of each mystery and print them off for your own personal use (there are plenty of copyright free images out there).
It’s completely normal to get a bit distracted during the Rosary, just remember to snap back into the mystery as soon as you find yourself drifting!