The best manual to teach you how to identify actinomycetes is Bergey’s manual of systematic bacteriology (Volume 5: Actinobacteria).
You may obtain it by clicking on this weblink.
(13) [Bergey's Manual of Systematic Bacteriology (second edition) Volume 5 and the study of Actinomycetes systematic in China] | Request PDF (researchgate.net)
Other texts also worthy of reading are (weblinks):
Taxonomy, Physiology, and Natural Products of Actinobacteria | Microbiology and Molecular Biology Reviews (asm.org)
Frontiers | Genome-Based Taxonomic Classification of the Phylum Actinobacteria | Microbiology (frontiersin.org)
Introduction to the Taxonomy of Actinobacteria | SpringerLink