Introducing your 8th grader to a foreign language is super! Beginning a foreign language during the Junior High years typically allows the student to acclimate better to the language before he/she graduates.
There are many great homeschool curricula out there that introduce your student to the language using a whole word or whole meaning approach. This means that instead of learning the language by a "textbook" method (vocabulary etc.), they are learning the language with meaning.
I particularly like the online curriculum that offers immediate feedback if the student is pronouncing correctly or not. They use a microphone either separate or connecting to a headset, and then speak the words as they are learning it. This method is extremely beneficial for keeping the student pronouncing correctly.
There are even other curriculum that introduce the student to complete thoughts through pictures and speech. They allow the student to repeat and practice these thoughts - adding meaning to the words that the student is learning. This method is not only great for younger language learners, but is definitely FUN!