HI,

For the first question that you have asked there is no specific law that you have to practise before joining ajob. practising is good it helps to know all the areas of law and that will help in any post of job. 

Coming to your second question if you are good in communication then its a best option for you to adopt. You can do MMM i.e. masters in mass media. Minimum 50% marks are required. 

Hope it is helpfull

Thank you