I am flexible as far as teaching materials, although I strongly recommend the "New Czech step by step" which in
my opinion is the best Czech textbook for English speakers.
The Textbook, the Activity Book, the CD and the overview of Czech Grammar in a Nutshell (in one package) is available
for sale directly from me.
If you need to start to speak relatively soon, I recommend the "Czech Express" textbook. It is designed to teach
basic communication skills with less emphasis on grammar and to reach the A1 language level quickly.
It is supported by CD and set of flashcards. Also available for sale directly from me.