Coinmarketcap.com, look at the top 100 or so. Recognize any vaguely familiar names, google it; spot big movements up or down relative to others, google it; low market cap compared to volume, google it. Also look at top 10 bla bla articles, disregard their opinions and google the ones you haven't heard of and those that might interest you. A few of the ways iv found more obscure but promising coins.