Right hand weapon 1: Raw dragon slayer's axe +10.
Right hand weapon 2: Sunlight straight sword.
Left hand weapon 1: Golden wing crest shield/shield of want, target shield.
Left hand weapon 2: Saint's talisman +10/Yorshka's Chime+10.
Spells: Great lightning spear/sunlight spear , lightning blade/darkmoon blade, great heal, wrath of the god/lightning storm , tears of denial .
Rings: Morne's ring, Sun first born son ring, sage's ring or lightning clutch ring, saint's, deep or darkmoon ring.
Armor: Hood of Prayer, Robe of Prayer, sorcerer's gloves, Skirt of Prayer OR Silver Mask, Leonhard's Garb, Assassin Gloves, Leonhard's Trousers.
Playing as a Cleric is simple, and is about casting your miracles from a safe distance, except for AoE spells.
If you need to melee first cast tears of denial , then cast sacred oath with sunlight straight sword weapon art, finally buff your raw dragon slayer's axe with lightning blade or darkmoon blade. This should give you at least 744 to 816 AR (when equipping the lightning clutch ring).
If you need a better armor, switch the sage's ring or lightning clutch ring for Havel's ring, or/and increase your vitality by 5 by leveling up to SL 125.
My advice to you is to learn to time your rolls instead.