it would be best if you could answer the questions Chelek mentioned above so other people could give more accurate suggestions.
that said, assuming that your practice is Theravada (noting meditation), here's a good instruction i've been using from Shinzen Young.
see: http://www.shinzen.org/Retreat%20Reading/Focus%20on%20Change-Summary.pdf
for best context, i suggest you also checkout the five ways. so that you have more options.
see: http://www.shinzen.org/Retreat%20Reading/5%20Ways%20To%20Know%20Yourself.pdf
in my experience, Shinzen's description of noticing the vibrations was the most concise instructions i received. since then i've been surfing waves/vibrations like a newbie surfer

good luck!
~C