Use whatever rings you see fit, I personally recommend this set up if you are more of a melee type; but if you like to cast spells you can use the first-borne ring to boost miracles.
Same goes for the spells, this is the most "accurate" setup which will defend you both from physical and magical threats but you can adapt it to your own playstyle.
Here are the possibilities I recommend if you want to roleplay:
Great combustion/fire surge = IGNI
Emit force/Force/God's Wrath = AARD
Karmic/(Great)Magic. Barrier = QUEN
Undead Rapport = AXII
Tranquil walk/V. of Silence = YIRDEN
You can use Healing miracles to make things easier since you will not be using shields... and also Guidance to recreate the "Witcher Senses"
Needles to say that the objects mirror a Witcher's tools:
Estus = Swallow potion
Green Blossom = Thunder potion
Resin = Bade oil
Purple moss = Various antidotes
The Silver pendant is the cherry on top of the build since can give you the QUEN shield effect and can be seen as the medallion's equivalent.
Good luck on the Path!
