I refreshed mine last month. Your course coordinator will provide you with the only text book you will need - the TNCC textbook. You may also be supplied with access to a few ‘special populations’ modules, which should be completed prior to the start of the course. In addition, you can access a mock written exam, some of which you may (hint, hint) find in the final written. The practical is a slight variation of PHTLS.
I would confirm who you are getting a text through, it is not mandatory for the class to provide you one. I would assume that your education department has a stack of them that they lend out.
Also remember that the ENA has built this as an introductory course for ED nurses who have APPs and physicians present in the ED, so don't expect to be performing any advanced interventions like intubation, central line or RIC placement, chest tube placement, et cetera.