just a personal comment, Cell group may not be a good idea,
Bible Study group may be more appropreiate in this case...
OK, to help you start it off, here is a short background intro to
the book of James.
From Matthew Henry's Commentary
Introduction to the Book of James
This epistle of James is one of the most instructive writings in
the New Testament. Being chiefly directed against particular errors
at that time brought in among the Jewish Christians, it does not
contain the same full doctrinal statements as the other epistles,
but it presents an admirable summary of the practical duties of all
believers.
The leading truths of Christianity are set forth throughout; and on
attentive consideration, it will be found entirely to agree with
St. Paul's statements concerning grace and justification, while it
abounds with earnest exhortations to the patience of hope and
obedience of faith and love, interspersed with warnings, reproofs,
and encouragements, according to the characters addressed. The
truths laid down are very serious, and necessary to be maintained;
and the rules for practice ought to be observed in all times. In
Christ there are no dead and sapless branches, faith is not an idle
grace; wherever it is, it brings forth fruit in works.