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I need a book that lists Wehrmacht Divisions during the war, lists details about them. And also i need a book on German Insignias. Please give me a list of books i can buy. Good Books. Thank you.

Nafziger's books might be what you are looking for. Hard to get and pricey, though, but more reliable than Tessin from what I understand. As for insignias, do you mean unit insignia?

Ranks on the uniforms, Medals, Unit Patches, Lower Sleave bands, The colors on the sholder borads to tell What there job was. Kinda all of it all in one.

There are plenty of websites that can give you that information, such as...
http://www.wwiidaybyday.com/uniformen/uniformmain.htm

And the Nafziger OOB files are now also on-line...
http://www.cgsc.edu/carl/nafziger/index.asp

For OOB you also have the 3 volume set by Samual Mitcham and his additional Panzer Legions book, which have been re-printed by Stackpole. Not as in-depth as the Nafziger volumes but good for a brief overview and history of the divisions..
http://www.amazon.co.uk/German-Order-Ba ... pd_sim_b_2
http://www.amazon.co.uk/German-Order-Ba ... pd_sim_b_1
http://www.amazon.co.uk/German-Order-Ba ... 654&sr=1-2
http://www.amazon.co.uk/Panzer-Legions- ... pd_sim_b_3

And then there is The Wehrmacht At War 1939-1945 by Andris J Kursietis which lists the commanders of the various military commands, including Wehrkreis, down to Divisional level...
http://www.amazon.co.uk/Wehrmacht-War-1 ... 830&sr=1-3