Unless your company has a ridiculously poor onboarding process, the obvious questions should already be taken care of. Someone will undoubtedly meet you on your first day and will show you to your desk, give you some paperwork to fill out for taxes and benefits, give you information about accessing the systems, and whatever else the company needs to give you.
Realistically, the questions you're going to need to ask are things that the company failed to think about when putting together the onboarding process. It is unlikely that these are things you are going to think of in advance because they are invariably very specific to the organization and to the role. If you are a software developer, for example, there is a decent chance the the documentation on how to configure your development environment won't be 100% clear and you'll need to ask someone to clarify or that an account hasn't been set up in some system that you need to access yet.