Probably the best site for searching Nostr right now that I know of is Nostr.band. Nostr is a protocol, like the internet, but it’s like the early days of the internet before Google and other powerful search/discovery tools were created. There are people creating ways of organizing and searching information on it but it’s all so new that you find out a lot of things by trial and error or suggestions from other users. For now the best answer to your question is for you to start talking about and posting the things that interest you, and follow people who reply and have a shared interest. Share it on your other social media and convince a few friends to come try it out with you.