Importing a map from the model resource

I am pretty sure the majority of us modders get our crap and content from the VG resource. I am a new one to the modding and creating of things. Read some things and concluded map making is the best place for me to start.
Now here’s my issue. I got this map downloaded, but I have no idea where to start and how get it into hammer. The 2 3D programs I have are Blender (with the source tools) and Autodesk. So yeah, what do I do first?