there are great tips in the Amatuer gardening magazine.
For the fencing hammerite is great, i used it on my old gates, and it looks fab now.
For edging you can use bricks, railway sleepers or other kind of timber, roof or kitchen tiles or wattle panels, which are really fun to make!
To make the garden look more interesting you can paint an old wheelbarrow and plant it with colourful flowers, and scatter some plants planted in old sauce pans (maybe painted) or some interesting looking stones.
Old sinks and buckets make lovely containers, too.