I just got an early email from a professor letting me informally know that I've been accepted for the PhD (CS) program at his school in the US. I only just applied to very few schools (actually just two), and this school (and prof) was my top choice. Should I just excitedly tell him that I accept his offer? Could anyone advise me regarding the proper protocol for responding to such an email. And what sort of a reply the prof might be expecting. For example, could I immediately ask about the research projects I would be likely to work on in the email? Would he be expecting that? Or should I just keep the content limited to the fact that I accept this offer and am excited to work with him. Are there any other key things that I should ask him. I live outside the US and am not sure about the exact protocols at the moment.