To answer your second question: the Golden Age Flash (Jay Garrick) appeared in Flash Comics from 1940-1949 when it ended at issues 104. Once the Silver Age Flash (Barry Allen) got his own series (after his first few stories in Showcase) DC started a second series of "The Flash" in 1959 but started the numbering where the original series left off, so issue 105.
According to Wikipedia Flash Chronicles 1 contains Showcase #4, 8, 13-14 and The Flash #105-106
Hope that helps
JAG2045