This is not on here but here: http://www.atarimania.com/documents/Atari-BASIC-Tutorial.pdf
Mind you though it is a slow loading website so once you get the whole .pdf, i suggest you save it to your PC for the next session.
EDIT: Ooops, didn't check the date on the original post, anyway the link may help someone else, as for the OP, he probably is a BASIC expert by now. LOL