many of the horus heresy books arent directly linked by characters and plot, they are set before, after or during the events in previous books, so i dont think it matters which order you read them in provided that you read certain books that follow the same plot in order, although it is probably a good idea to read the first three and then the others. i looked up his blog, there doesnt seem to be anything wrong (other than his ongoing epilepsy) with him. i just hope he can cope with his epilepsy.