Total newbie needs some help

Hi,
I have a dwg file which is a 3d model of an item. It has no measurements on it.
What i'd like to do is "flatten" the model to 2D and turn them into flat CAD drawings.

I have no CAD software so wondered if this was possible in a free download (mac) and an explanation of how it can be done.
(Will i need to add my own dimensions for example or are they somewhere hidden?)

Thanks kindly

Try Autodesk's Fusion 360 product. Not sure on the "flattening" part. There is a new feature of the software that does 2d drawings from 3d models. I haven't used that part yet but it was just added. There should be some videos on how it works on their site.

Thanks i'll give that a go.
:)