Sharon
The DWP should contact you, but you will need to complete an ESA3 with details of your financial circumstances, the process should only take a couple of weeks. If they haven't contacted you by the end of the month then I would chase the DWP office dealing with your claim.
The change to WRAG payments only applies to claim made after 3 April.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems