Can you check in even a tiny change to the source-code repository? A new project's first commit often triggers a slew of politics: wait, you're building what? Where's your design? Who approved this? Why are you naming it this and not that? We already built this; why are you building a second one?
What's your installer story? For installable software, do you know how to produce the installer for it? Too often the installer work is left until just before launch, at which point it's way too late. For a service, do you know how to deploy anywhere but localhost so your team can start doing internal demos?
Can anyone besides you build your hello world code? The release team often has their way of doing things, and it's not what Visual Studio spits out from its new-project template. Might as well integrate early, rather than wasting time solving problems for a build system you were never going to use.