My advice is find a local pheasant shoot and over your services as a beater. You will end up with a brace of birds and may even get paid. If its a syndicate run shoot you may also end as a gun on the shoot when a space becomes available, but you may have to put in a few seasons beating before that happens.
Start with an airgun and shoot vermin (rabbits, crows, magpies squirrels etc) leave the pheasants well alone.
To do this you will need the landowners permission (the hard bit)
Then move on to a shotgun and start to practise on the clays and mix that with beating and you'll be well on the way
PS Game licences are now obsolete
Good luck