Hello,
Sorry I forgot in my answer:
You can/should have a look at SAP IDES. Here you have a lot of training materials about FI and CO.
http://help.sap.com/saphelp_46c/helpdata/de/af/fc4f35dfe82578e10000009b38f839/frameset.htm
You can also find a description of the SAP IDES on this site, and the data which is available in the system.
And this is one advantage, that you have data in the IDES system.
PS: Also find a lot of materaila on:
www.amazon.com
all the best Erwin