There is a wealth of material to support both SystemC and JTAG on the Internet.
The Open SystemC Initiative (OSCI) provide an open source reference implementation of the SystemC library, which includes tutorial material in its documentation directory. These may be accessed from the OSCI website (www.systemc.org).
OSCI also provide a number of public mailing lists. The help forum and the community forum are of particular relevance. Subscription is through the OSCI website (see above).