Pick someone you know and respect, go to their profile and see what relays they use. If you want, take a look at my relay list. I’ve been happy with it. I recommend using the NOSTR.wine paid relay. They also offer a filter that will be a paid service soon.
A lot of people use #[2] here for zapping as well. As Derek said, keep most of your coin in cold storage. Id recommend moving 15k sats or so to a wallet for zapping. If all goes well; you won’t need to refill. Once you start zapping, people will zap you back. You’ll get a zapped for being new as a welcome to NOSTR as well. 🤙🏻💜🧡⚡️