what build should i try out.

just started to main darius and such. i cant seem to find what runes or builds to go. on this sub they have links to u.gg and op.gg which give totally different builds and runes lots of item paths and such. im an old player so i usually go with conq and insp and build stride into deadmans into trinity. but the more i see there are phase rush, yomuus etc.