We study the non-lightlike ruled surfaces in Minkowski 3-space with non-lightlike base curve c(s)=∫(αt+βn+γb)dsc(s)=∫(αt+βn+γb)ds, where tt, nn, bb are the tangent, principal normal and binormal vectors of an arbitrary timelike curve Γ(s)Γ(s). Some important results of flat, minimal, II-minimal and II-flat non-lightlike ruled surfaces are studied. Finally, the following interesting theorem is proved: the only non-zero constant mean curvature (CMC) non-lightlike ruled surface is developable timelike ruled surface generated by binormal vector.