when working out bass lines use the three notes of the suitable chord,in preference notes 1 and 5,plus passing notes 2 and6[To begin with]avoid first inversion although occassionaly its right,avoid doubling third notes of the major chord,although its ok with minor chords,and finally use your ears as the final judghe ,if your breaking rules but it sounds good ,dont worry about the rules.
Modal chords[chords leaving out the third note]with added spread dissonances often sound good too,on the English this might be two dyads lets say cg folowed by gd [all in the same line on the left hand side].http://www.dickmiles.com