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Next question is what sort of style you want - exotic/tropical, cottage garden, formal/architectural, Mediterranean etc. You can get a rough idea of what these mean easily on Google images.
Will herbaceous perennials that die back completely in winter be ok, or are you looking for deciduous shrubs (which have a woody frame even after the leaves have fallen), or do they need to be fully evergreen?
Are you more interested in flowers (in which case, what colour scheme) or interesting foliage?
Thanks @lemonade
Good question - it’s an east facing garden so not much of it gets full sun all day - part shade, probably?