Seeking practical frameworks to design a calm, trustworthy brand color palette

[Jason37]

I'm a self-taught graphic designer working on a branding project for a wellness startup, and I'm struggling to move beyond my instinctual color choices to a more intentional palette rooted in color theory. The client wants to evoke calm and trust, but I'm unsure how to effectively combine hues, saturation, and value to achieve that specific emotional response across their logo, website, and marketing materials. For designers well-versed in theory, what practical resources or frameworks do you recommend for constructing a cohesive and psychologically effective color scheme from scratch for a brand?