if your landing page converts decently (say, 5-10%) you're gonna make 5-10 leads a month. Is this good, or bad? I don't know, only you know your goals...
Traffic without PPC for leads generation... hmm, that's a bit hard I think. Maybe outright buy them from leads generation companies, or advertise on popular newsletters in your niche, although this could be a PPC of sorts... I remember 10-12 years ago DOE (Directory of Ezines) used to be pretty good, but I don't know anymore. You can look into that ype of advertising if you want, but you'll need to know what you're doing and track your campaigns very well or you'll lose money