submission for a beginner

I have recently started an online BDSM relationship with this guy in a military. He is away on a long mission. When I write to him and ask questions he almost never answers my questions. He likes to see my pictures and whenever I send him my pics then only he responds. He say he is very busy or does not have internet. Should I still write to him daily? Even though I know he only responds to the mails with my pics? He says he is very serious about me but I am not so sure about it. Am I too hung up on this dominant guy or should I make myself very clear to him? Should I not write to him for some time and see do I even hear from him?