I have a bookkeeping and accounting service in Aberdeen NC. We specialize in church accounting and would be more than happy to schedule a workshop for/with your church. Our website is http://proverbs243consulting.com
This one is not a "learn online" but a real live workshop with Q&A time...I attended one and highly recomend it!!
http://www.irs.gov/Charities-&-Non-Profits/Upcoming-Workshops-for-Small-and-Medium-Sized-501(c)(3)-Organizations