SAMPULATOR: http://sampulator.com/
MORE BROWSER INSTRUMENTS: http://www.factmag.com/2016/11/12/browser-instruments-html5-drum-machines-synths-samplers/
REAPER DOWNLOAD (if you don't have a DAW): http://reaper.fm/download.php
SAMPLES FROM LEGOWELT: http://legowelt.org/samples/
MORE FREE SAMPLES: http://www.factmag.com/2017/03/25/best-free-sample-packs-download/
OTHER RESOURCES:
https://learningmusic.ableton.com/make-beats/beat-and-tempo.html