All the instruments, melodies and arrangements have been 100% made by the producer. No free-royalty use loops have been used to create any part of the instrumental of this track. There can only be loops only in the drums section (claps, shakers, top loops, etc) and ambient or vocal samples as a support of the production arrangement.
I usually start my tracks with my drums, and try to find a really nice groove. Then i make a bass (normally use Sylenth1 or SubboomBass vst) that conversate with the groove. Then i go for the break and try to find some crazy synth or vocal, and see the punch between the two parts. But, of course the process is variable.