Do you think Laxmī and Nārayana are two separate entities? How do I explore different Vaiṣṇava Sampradayas?

According to Madhava Acharya, Bhagavān Viṣṇu is separate from individual souls and the material universes. I do believe Laxmī and Nārayana are separate Goddess and God. They cause the material universe and souls to manifest. Edit: Viṣṇu and Nārayana are two names for the same God. How do I explore different Vaiṣṇava Sampradayas? I live in USA and it is difficult to find them in person. I only know of Iskcon, which is one of Gaudiya Vaiṣṇavism. I want to explore more of them, before choosing one.