I use Google Sketchup for the 3D renderings in the videos. When I first tried Sketchup, I was arrogant and dove right in without any instruction. In short order, I realized this program doesn't operate the same as other 'drawing' programs. Then I found the tutorial videos on how to do some simple operations in Sketchup. The videos really got me going in the right direction. If you decide to give Sketchup a try, be sure to check those videos out - they will save you a lot of frustration.
Google Sketchup is free (there's a Pro version version but the free one does everything I need). Do a Google saecrh for Sketchup Download and you'll be sure to find it. There's also something called the 3D Warehouse, where people upload their sketchup drawings to share. This library has proven helpful in many ways. I've found a few models of furniture I'd like to build in the future, so having someone else do the drawing was a realy time saver.