Hi, there are a couple of things to consider. First, if/when you monetize, do you want to have different Adsense accounts? If yes, then you probably want different emails. If no, then you don't need another email. Second, are you doing alone or with others? If you are working with others, set up your email first that will be shared as changing emails/ownership later is a giant pain in the ass. If you are going at it solo, then a single email with multiple channels should be good.