Important thing is that you have recognised the need for extra stimulation. Things sound as if they are going well (babble and general interaction.)
Not sure if asking people to read Hanen manules without the back up of a course is a good idea. A lot of people like 'Baby Talk' very much-written by a highly respected (and sadly deceased salt.)
I would consider pursuing something for its 'activity' worth rather than its language worth. The language will develop around the situation in a much more natural way then. Swimming (splashing,cold,kicking,ready 123,under we go,dring,towel and so on) cooking,gardening,sandpit.
Do you take part in any activity/play groups? They provide purposeful semi structured stimulation.
Baby signing very much in vogue at present and very useful (just run a course myself along with a music therapist-amazed at how much 'my' 6-18 month old NT babies came on in a global sense over 6 sessions!) If you can't access a course,I would highly recomment 'Sing&Sign' (video/dvd available through website www.singandsign.com)Tremendous fun and the creator is really on the ball.
Do you have other children over? Would suggest maybe just one or two (non dominating) similar aged ones so that you can hear and be stimulated by the mother/child interaction in that sense.
My music therapist colleague (who is very much on my wavelength) speaks very highly of the Bby Mozart/Einstein stuff. Not familiar myself,but trust her judgement.
Feeling loved,secure and knowing that someone is interested in everything you say and do is the best 'remedy' to encourage language in a delayed child. Won't always 'work' 100% with more complex comm. disorders but you do sound as if you are on the right track.
At the risk of csounding pompous,if you do a search,i have attempted to give similar advice to other posters which you may find useful.
Hope this helps.