Just to give you a quick list of what these rituals do or mean:
1. A way to give a personal homage to each God.
2. A way to connect to each God, and by connecting, I mean tuning to each God's energy or cosmic frequency.
3. Each God represents a transcendental process of the soul, and doing these rituals can help guide these very processes for your own.
At the bottom of each ritual, it's explained that the SHEN RING is from Egyptian Hieroglyphic language. It survived in Chinese tradition as a glyph for Spiritual Force, Divinely Force and God.
And yes, beginners are more than welcome to perform these rituals, although I believe it's definitely recommended to have been meditating for a month or two. At the very least, be actively meditating right now.