well some of these sentences are grammatically wrong, here is the right:
1 : "You will get totally 8 text messages" or "You will get all of 8 text messages"
2 : "You will get 8 text messages in total"
3 : "You will get 8 text messages totally"
and about this sentences, that's the right one !
"I'll sign up for evening classes" means that I'll complete an form for the evening classes... not teaching, just for studying
Student or Learner