The book "Joy of Smalltalk" by Ivan Tomek was written to teach programming in Smalltalk. You can find it at http://plato.acadiau.ca/courses/comp/tomek/jos.htm
It is for VisualWorks, so a lot of things will be different, but most of it will be the same. You should give it a try and let us see how well it works.
You could get a free version of VisualWorks, but the book was written 10 years ago so VisualWorks has changed since then, too.
-Ralph