As Brad says, fusion360 - amazing package for free. Don't waste time with anything else!
@Rocketman - I'm sure a 3D package can do 2D, could be wrong though. I've used it for creating drawings though to cam tool path generation in both 2D and 3D.
I've found loads of free stuff about, nothing with the power of fusion. If you're going to get familiar with a CAD package, I wouldn't invest time in anything else after what I've learned.