Hi Kerry, for early on, snowdrops, hellebores, sarcocca (several species, all good), Cyclamen coum.
A bit later, pulmonarias, epimediums
Later on, hostas and ferns as marshmello says. Various corydalis, Lily of the valley, Astrantia, I think i said geraniums before but G. macrorrhizum is a good ground cover for shade, comes in colours from white through pinks to magenta
Even later, Aster divaricatus, strobilanthes,
And in late summer/autumn, Cyclamen hederifolium.
Fillers in like forget me nots and honesty will do OK in shade
Will that do to be going on with?