Hi @67Andyc not sure if I’ve got the gist of your question, but if you’re looking for “ready to go” models online, this is one of the most popular:
If you’re looking for something other than freecad, you might want to check out Blender and Autodesk’s 123D Design and Fusion 360. Both Blender and 123D are free, and Fusion 360 has a free year.
For your very first prints, I’d actually recommend something fairly simple. It’s a good idea to get a “feel” for how things work before tackling the more complex prints.