tbb1 would be my first. then ttb4, then tbb2, then tbb3. Why?
tbb1 are the basics, teaches the principles of the designs, etc.
tbb4 has some updates on the ttb1, but also teaches you how to get the most from your bows.
tbb2 is an excelent book, teaching you to create other designs, using boards for bows, making strings...
tbb3 just is one excelent read with the 'bows ofthe word' chapter, very interesting facts about quickdrying int the stoneage bow chapter,
but really, you should just buy the whole pack.
Nick