Get Started with CostX
This is a simple guide on getting started with CostX. I use the education license version for this guide so that this will be useful for both students and new users.
Start CostX from [Start] > All Programs > Exactal > CostX. If this is your first time to use in your PC, you will be prompted to insert license details. Complete the licensing by providing correct details. Otherwise or after this, you will be prompted with “select building” window. Here you can select an existing building, or create new building or even a new project.
CostX Tutorials
This is a beginer tutorial on taking measurement using CostX. It introduces the measurement tab in the task plane and shows how to use tools in the Drawings and Dimensions tabs in the Ribbon effectively. It also introduces the techniques that can be used to increase the efficiency level in taking off measurement.
This is an overview of BIM estimating with CostX. I recomend you view this to get a feeling of what you can do with a BIM model before you move to the next video. 
CostX supports Autodesk’s data rich Design Web Format (DWF and DWFx). DWF is an open file format that is used to share designs across variety of applications. For simplicity, you may consider DWF as an alternative to IFC, the native BIM file format. However, information included in two formats may slightly vary. CostX very well support DWF fromat, has number of built in features for automatic quantity take-off and estimating.