A lot of the name reactions books have a pretty hefty section on reactions to make heterocycles, so that's a good place to look. There is even a book just on named reactions in heterocyclic chemistry. One book that I have found useful is "The Chemistry of Heterocycles" by Eicher abd Hauptmann. It has less synthesis, but lots of info on the properties and reactivity of various heterocycles.
Is there one particular heterocycle you are interested in? There are whole books on the different heterocycles, including some series like "Progress in Heterocyclic Chemistry" which constantly update.