Starting buddhism in the Theravada tradition

I am not entirely new to Buddhism, but I am new to it from a perspective of an academic path. I have an academic background in another field (Ph.d level) and where I live there is zero buddhists within a 100 miles of the theravada tradition which interest me both. I have begun a practice in insight and concentration meditation, but my skill is relatively weak. While I am building up my practice I wish to study the theoretical background of the Theravada system. I have access to many of the major treatises of the Pali canon, but since none of this is organized in a linear fashion it is quite a complicated matter to dig into these texts. Where should one begin, so far I pick up a book on the Noble eightfold path by Bikkhu Bodi, and its great but I am finding myself stopping frequently to look up many of the topics there in this little text alone. Is there anything straight forward, linear that deals with the theoretical topics for a beginner who wishes to expand into a higher level understanding? Thank You, jwe