Here are some useful links for materials and forum

http://sapebook.blogspot.com/2007/11/free-sap-sd-pp-qm-wm-pm-ps-hr-fi-and-tr.html

http://help.sap.com/bestpractices/bblibrary/bblibrary_start.htm

Here is the forum where you can search for most of the problems you have faced in SAP.

https://www.sdn.sap.com/irj/sdn/forums

For FICO , click on SAP Solution -->ERP Financials