You can probably start by looking through platforms like Dextools and Dexscreener. Usually these memecoins appear there as soon as they are launched, but the problem is there as so many that never make it that high in 24 hours. Most of them are just scams and rug pulls. It's a huge gamble if you are lucky to get one that goes to grow bigger over time and get listed in bigger exchanges
Dexscreener remains the best to me in spotting this low memcoins. Over the few days we have seen many coins been lunched under Solana ecosystem and within days they easily pull a 10x increase. Also they’re others that easily just rug pull immediately they get lunched and people start pouring in volumes. One thing I will advice the degen traders because that’s what they call them selves is to never consider this memes as investment but rather as a gamble and the money they put into it is just like a wager to gamble. And once you see a little a profit take some off and convert to something solid like the parent coin itself Solana.