Question, Anyone…

Question-Mark-Man2

After reading about bundles and funnels for building sales, I think I really like the concept. I want to do something along those lines. Trouble is, the book I’ll be releasing next is only Book 2 in the Wake-Robin Ridge series, so I’m not sure how to go about it. I think what I want to do is offer Book 1 free in conjunction with Book 2. But that’s hardly a bundle. How would I go about doing this? Would I combine both books in one document, making clear that Book 1 is being included at no extra cost? That seems like the easiest way, but I’m not sure if it’s the best way. What am I overlooking? Anyone?