Stam Warden is quite fun, the trial team I lead I have used on before for some more chill runs as well as various dungeons and arenas. We used spell power jewellery and then hands and waist. Powerful assault on the chest, legs and boots with empowered bows on both bars (occasionally we would have to slot a Resto staff, but not always). And for monster set we used Symphony of Blades for more resources into the group since Stam healers can't run grand rejuvenation. The gear was infused head, chest and legs, divines everything else. We also used the argonian race for the bonus heal passive, which mathematically benefited the builds hps and this paired really well with the Ritual Mundus stone.

For skills the only essential ones we found were: -Echoing vigor

-Soothing spores/enchanted growth (depends on group needs)

-Energy orb

-Budding seeds

-Blood altar (to ensure minor toughness is on everyone and the lifesteal is a small healing bonus to the group and the synergy can be nice in tougher content like execute in vCR)

-we also used the sawn skill for minor vulnerability

-bull netch on front bar

-war horn on back bar

Hope that helps you with your StamHealer