A good starting point is Stefan Lundgren's "Baroque Lute Companion". Stefan
quotes many primary sources and gives illustration (not to mention the many
pieces in increasing difficulty). But - contrary to the renaissance I don't
know of any explicit "tutor" (introducing into baroque playing) so
I hope you haven't taken this quotation from my webpage where I quoted the
same passage :-)
I've already answered in a different mail and although not knowing this
quotation at that time I still think my remarks are valid. You know: what
does "profit" mean in that context?
Best wishes
Thomas