If you want to get the code to work nicely with Visual Studio, you're going to have to do a bit of manual work.
Step 1: Get the WPILib and NT-Core header files. These will usually be under ~/wpilib
You can add these to your project's header files include directory. This should fix up any false-alarm syntax errors you might be getting.
Step 2: Configure your build system.
This is a bit difficult. First, you need the FRC C++ toolchain installed and added to your PATH.
Next, you have to use some form of build system to send over and compile your code. You can use the one provided by WPILib for this.
WPILib uses ANT to build and deploy code. Visual Studio supports ANT builds and you can find instructions
here. Reconfigure your build targets to use this build system, and you should be set to go. If you're stuck looking for what tasks to run, run a simple build in eclipse and take note of what tasks are executed, that should help you.
Keep in mind this is only to build and deploy code. The code you build will not run on your system, as it's built for an ARM target (the roborio)