Vaccines are not required, except Yellow Fever if you are foming from a known infected region. That being said, I believe I got a booster for Tetnus and a couple others that I don't remember off-hand. And I already had all my Hep shots.

You'll definitely want anti-malarial pills.

In response to your other thread about where to get them, try a Doc-in-a-Box place. You might need to call a couple to see if they have the vaccines but that's probably your best bet since you are going to be on the road for a while.