Sorry, when you say nylon strings do you mean in terms of instruments or just in terms of strings for your instrument?
As for advice, well. It doesn't come easy, there is no shortcut and your playing will only improve if you practice and challenge yourself. Take lessons if you can afford it. Even just a few can really help. Reference as many books as you can, as each will explain things slightly differently and one explanation may make more sense to you than another.
But most of all enjoy yourself and practice for the love of it!