basically a dex/faith build
rings: life ring + 2 , southern ritual ring + 2 for 3 slots, 3rd dragon ring, ring for faith + 5
basically you save level points because of your intelligence and attunement, you still are able to have sunlight spear and sunllight blade because of the southern ritual ring + 2. Now, you can spend more points for high vigor/faith/dex
weapons with dex and faith scaling or other weapons with lightning enchantement ( nice weapons: Murakumo +10 lightning , richards rapier + 10, …(find your own weapon ;) ) you can also use heide weapons but they aren't really strong..
shield: defenders shield or kings shield
for full Sunbro feeling: Heide knight set
Sunlight spear, Sunlight Sword
cast sunlight blade and head into the fight. try to use sunlight spear when your enemy is trying to cast something - even if he hits you then your damage on him will be higher most of the times