Before you do any planting, look out of your windows, then fix a focal point for something a bit interesting like a mini ring of standing stones, preferably with the aid of some dousing wires to find an old ley line. Then if you are into folk music and legends get a book of herbals and try to theme it around a mystics garden with wolfbane, digitalis, ladys tresses etc.
I theme all the gardens I build and have great fun researching a theme. Just remember there is no such thing as low maintenance.
Coloured Veg. is all the rage now with purple spuds, black tomatoes, white radish, pink cauliflowers. so no need to seperate veg from flowers mix them all in. One of you first jobs is to get a load of dung and spread it on top so the goodness gets into the ground for later years.