I'd highly recommend this piece...
https://steemit.com/ico/@frankben/how-i-made-1-270-gains-by-investing-in-icos#@frankben/re-lighteater-re-frankben-how-i-made-1-270-gains-by-investing-in-icos-20180102t163846708z

It's focused on ICOs, but much of the research and filters he talks about apply just as well to you when you're investigating any coin.