The traditional framework
Much twentieth-century Wiccan writing describes a Goddess and a God: the Goddess often associated with the moon, the earth and three phases of life, and the God often as a horned god of wild places and the turning year, whose story is told through the Sabbats. This is the framework most Wiccan ritual was written around.
The Horned God is not the devil
The horned imagery draws on classical figures such as Pan and Cernunnos, and on nineteenth-century Romantic revivals of them, not on Christian demonology. The overlap in imagery is an artefact of how the church depicted its adversary, not evidence of any connection.
How people actually hold it
Literal: distinct divine beings you can address. Duotheist: one Goddess and one God, of whom other deities are faces. Polytheist: many individual deities. Archetypal or psychological: deities as real and useful images of human experience rather than independent beings. Pantheist or animist: divinity as the world itself, or as present throughout it. Non-theist: reverence for nature and cycles without deities at all. All of these are practised by people who call themselves Wiccan.
Choosing can wait
Deity practice is optional, and it keeps. You can observe the Wheel, keep a Book of Shadows, do ritual and practise magic without naming anyone. A patron is something some people find eventually; 'which deity is calling me?' is a question from the internet, not from the tradition.
If you want to explore
Go slowly, read about a deity in their own cultural and religious context first, start with acknowledgement rather than requests, and let it be a matter of months rather than one evening. Concluding that a deity isn't for you is a normal outcome, not a rejection. Deity work and devotion is covered in depth in Going Deeper.