They don't need to be dried. There is no need to soak them. There is, however, a viability test for fresh seeds, where you put the seeds in a small container and fill it with water. Viable ones sink, while the nonviable ones float. Also, you could treat them with some anti-fungal solution or inoculant.
However, if you are planning to invest a considerable amount of cash and time into that grow, you really should get the seeds from a reliable source. Biggest reason being, they might not grow true (or germinate at all).