Tutorials/ How To
Autodesk InfraWorks Training Guide. Written by Autodesk, this pdf is useful for the first time user. It focuses on how to find and import data (in 2014 version).

Autodesk InfraWorks 2014 Learning Videos. A playlist of short how-to videos on the ADSKInfrastructure channel. Current videos are in 2014 version.

Getting Started with InfraWorks (2015). A series of 5 posts, by Eric Chappell, that cover the basics of starting a file. Particularly useful if you are unfamiliar with the new user interface in 2015. Also has the same posts for the old version, see Getting Started in 2014.

GIS Data
Free GIS Data. A comprehensive, categorized list of links to over 300 sites providing freely available geographic datasets. Compiled by Robin Wilson.

USGS National Map Viewer and Download Platform. Good source for finding and downloading GIS data throughout the entire United States.