Here is a site that may be useful:
http://www.kitchenculturekit.com
There are also threads in this section that will be of help, just nose around and absorb from the discussions that are going on.
Tissue Culturing & Other Propagation Techniques of Banana Plants - Bananas.org
Gabe15 along with many others here have myriad experiences with tissue culturing, and if you have specific questions, please do not hesitate to post threads and ask, because many others are probably lurking around wondering the same thing, and if not, for sure anyway it will help others in the future who are researching how to get started.