Summary: ``We compute the linear metric perturbation to a Schwarzschild black hole generated by a spinning compact object, specializing to circular equatorial orbits with an (anti-)aligned spin vector. We derive a two-timescale expansion of the field equations, with an attendant waveform-generation framework, that includes all effects through first postadiabatic order, and we use the Regge-Wheeler-Zerilli formalism in the frequency domain to generate waveforms that include the complete effect of the spin on the waveform phase. We perform the calculations using expansions at fixed orbital frequency, increasing the computational efficiency, and simplifying the procedure compared to previous approaches. Finally, we provide the first fully relativistic, first-principles regularization procedure for gauge invariant self-force quantities to linear order in spin. We use this procedure to produce the first {\it strong-field, conservative} self-force calculation including the spin of the secondary---computing Detweiler's redshift invariant.''