The Rooster had this exact injury six years ago. Right Medial Malleolus. Relatively mild ligament damage, 2 steel screws surgically placed. The Rooster was back rock climbing exactly six weeks after his surgery- against doctors recommendations of course. Some lead climbing in eight weeks, but well below the Rooster's normal limits. Primary trouble was overall joint weakness, which improved quickly with climbing. The Rooster recommends face climbing and would discourage sticking your foot in cracks until a bit later, but he thinks you will need no encouragement in that regard. That was the only action that was not really possible until about 2-3 months out from surgery. The Rooster went ice climbing on top rope ten weeks after surgery. Ankle was about 100% for all activities after 4 months.
For therapy, The Rooster recommends standing calf raises once you have some stability, lots of ice, and stretching exercises. Walking in sand at the beach (The Rooster recommends Hawaii)was actually also found to be a great way to strengthen the ankle joint, improve stability, and regain flexibility.
The Rooster had his screws removed 18 months later, and highly recommends you do the same- if you break it again with those in there, your ankle will be pulverized to dust.