Hi sylverk,
It is useful to study mythology, and try to find the patterns in which deities attract you and which do not. Even if you do not find a specific patron this way, you will learn about yourself and your concept of divinity. Many books on mythology are written in a fairly "dry" way, because they are geared towards academics and folklorists, not to people seeking to form a living spiritual connection with the deities they describe. Use the mythological texts as a starting point, and for reference, but understand that they in themselves will not provoke many spiritual revelations. Look to more creative works: to music, artwork, poetry, fiction and ritual, which deal with the same deities in a more intuitive and spiritual way.
It is likely that you will find a number of deities with whom you can feel at least some degree of kinship; do not be too quick to name any one of them as your patron. Who you feel closest to will often change as your needs, your sense of spirituality, and the pattern of your life does. The deities you work best with may be predominantly from one culture, or they may be from many different ones. It is a good idea to pay particular attention to the culture(s) that form your own ancestral heritage; you will not necessarily find your patron there, but you will find a sense of your own roots.
With each deity you feel a connection to, try to consider what it might mean to have Him or Her as your patron. How could you best honour this deity? How would you strive for excellence within His or Her realm? In this sense, a patron is like a role model. Every act that you do, you do in your patron's name. Your patron also reflects you concept of the divine, of what you hold sacred, and your spiritual path will reflect this concept. A child of Danu will walk a very different path from a follower of Ares, and a worshipper of Sekhmet, Odin or Arianrhod a different one still. This is why the forming of the patron relationship should not be rushed, or approached impulsively. It will guide your spiritual development throughout this life.
Some Suggested Exercises:
1) Do visualizations to meet both God and Goddess. This is not to say that there are only two, or that you must believe in one or the other. It is to look into what deital archetypes are most prominent to you.
2) Make as thorough of a description as possible, including those elements you know are special to them- gained through their communications, dreams, and the elements that surround them when you meet them.
3) Meditate on the idea of the archetypes being a pathway for spiritual growth. How does this knowledge effect you, your beliefs?
4) Build shrines to your archetypal Deities and your Ancestors. Describe or photograph your shrines and write about what offerings you decided to make to them.
5) Think about how you can walk the path of your patron Deity and begin to do so.
Keep a journal for one month.
6) Create or look for images that represent what you connect with as part of your personal images of Deity. Add them to your shrine.
7) If you haven’t already, research your ancestors, ask family members for stories they
remember. Try to get to know who they were beyond a name in the family tree.