This book teaches the fundamentals of Afrikaans. The dialogues and grammar notes enable one to begin using this language (both in oral and written communication). The pronunciation guide at the front is not enough to learn adequate pronunciation (nor is the pronunciation guide in any language book). Without the presence of a native speaker, one may get by with the tape "Afrikaans" from conversa-phone (also sold by Amazon). The Hippocrene Afrikaans-English/English-Afrikaans dictionary is a good first dictionary.
Why learn Afrikaans? As the newest Germanic language, its relationship to the other members of this family is fascinating. With a good knowledge of German, Afrikaans may be learnt in a short time. One reason for learning Afrikaans may be as a stepping stone to learning Dutch, as the two languages are closely related.
For English speakers with no prior foreign language experience, Esperanto is easier to learn but won't help you learn other Germanic languages to the extent a knowledge of Afrikaans will.