Welcome, JP. My suggestion is that as you make your way through the book, just post questions to this forum as they occur to you.
Much ground is covered in Learning Irish, so even though the individual lessons seem short, take your time with them and remember that a lot of information is contained in each one.
Also, I don't know where you live, but if you're in the US or Canada then you might check here and see if there are any teachers nearby:
http://www.daltai.com/classes.htm (Message edited by Domhnall_Ó_h_aireachtaigh on November 27, 2008)