As well as any general advice, I'd appreciate guidance on some specific questions:
1. Should I remove the plastic pond liner once drained, or will this be of some use to my vegetable growing?
2. Should I drill drainage holes into the bricks? If so, where and how many?
3. Should I simply fill the new bed with top soil and a layer of mulch on top? Or are there are other things I should add for a successful vegetable garden?
Many thanks for your help!