I use Dana Ullman's Guide to Homeopathic medicines and Homeopathic Medicines for infants and children also by Dana Ullman (not positive on those titles(they are upstairs) but if you do a search on the author it will pull up).
We do see a homeopath b/c ds had a reaction to MMR and we have been treating him for that and very successfully I might add! I also have had great success too as a patient with beating bronchitis, a nasty sinus infection and a plugged lymph node under my armpit all cured by homeopthic rememdy. No antibiotics at all!!!
Chestal the homepathic cough honey is awesome during colds too....that is a combo of remedies so that you cannot miss with when you are not sure for the cough.
Most of the time I just go with my gut on what remedy to choose. SInce we have ben doing it a while there are just a few that I know I can pull out to give myself or ds when acold or something minor comes along but I still refer to the books for home treatment. Anything else we put a call into our homeopath.
Oh Arnica is awesome too for bumps bruises and ouchies, and Apis for bee stings.