During the first few days it is important to control swelling and pain. Pain killers such as paracetamol and ibuprofen are important.
Rest
Reduce the amount of weight you put through your foot. Do not stop using your ankle completely; you should keep it moving as much as your pain allows
Ice
Wrap crushed ice or a bag of frozen vegetables in a tea-towel and apply it to the swollen area for 15 minutes every 2-3 hours. Do not apply ice if you are diabetic, have poor circulation or sensation in your legs, or the skin is broken.
Compression
Use compression bandaging (e.g. tubigrip).
Elevate
Keep the foot elevated (e.g. on a foot stool) when sat down. It is important to start moving the ankle as early as pain allows. Gentle range of movement exercises are key. Slowly progress through the following exercises. If your pain/swelling gets worse then move back a step.