i wanted to take up jogging for the first time but when i run my ankle gives way and becomes very sore, what is causing this?

When jogging, with each step you subject your body to a shock that is 2-3 times your body weight. That is a big impact on your body. Thus, you should start your running program with a lot of walking. Here is my Beginner's page that will give you some ideas to consider.

http://runninginjuryfree.org/2008/09/beginning-running.html

Be sure you have good shoes and the right type of shoes for your feet. Here are some ideas and links about shoes.

http://runninginjuryfree.org/2008/09/shoes.html