That is not a large topic, it is more like I have lost a grain of sand somewhere in the Milky Way, how do I find it? There are hundreds and hundreds of entire books on the topics you mentioned. Just a general shotgun blast approach isn't going to gain you much insight. Are you a dba by choice or an "accidental dba"? The direction depends greatly on your experience and knowledge of computer systems, networks, sql server etc. And fwiw 70 tables is quite a small db. Best thing is to figure out a specific topic and research it.
--edit--
Lysdexia strikes again.
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