So, budget of 1500. Cars and Environments are something you are interested in and with the target being broadcast.
For environments you can model them up yourself using a traditional modelling tool like Cinema4D, Maya, Modo etc. I doubt ZBrush would be good at this.
For Cars, you need to understand the basics first. Polygon modelling.
Polygon modelling is the same across most packages, if you learn it in one package then that knowledge is transferable to another package. You will understand how to create and manipulate vertices, edges and faces to construct a model. The tools to manage the elements of a 3D object are also found in each package so again, transferable.
To get faster at modelling and produce enhanced results, you will start using the more advanced modelling tools of the package. As an example, cutting holes into objects and making the edges automatically have smooth bevels around the hole edge, that is called a Boolean operation. This is where the packages my be great at it or terrible and it is these more advanced features that will either allow you to model quicker with good results or spend time fixing an operation to make it look good. That comes with a price and why we have expensive 3D packages and cheap ones.
Believe it or not, many complex models start out as a Box or a Sphere and are extended from that.
If you want to find what tools are used in Broadcast/Film then do a google search for things like "What software was used to create Avatar" You will be surprised at how many different packages are used but that is a AAA blockbuster movie so you would expect no expense spared and a huge team of specialists.
Also, broadcast studios will have many team members responsible for different areas in the production pipeline. If you want to be a modeller then you are one cog of many. As you learn, keep half n eye open for what your model will be used for.
It sounds like you may want to be an Asset Modeller or an Environment Artist. Asset modellers do just that, they create assets that will not usually be be animated and are placed throughout a scene as filler content. Your job would be modelling up bespoke content like a Kings Throne, Weapons, Futuristic appliances, basically anything that can't be bought from a 3D stock model library for $99
An Environment artist has a bigger role and traditional art skills (form, light and shadow, perspective etc) would be very useful here. There are some tools that create environments for you like Vue
http://www.e-onsoftware.com/products/vue/
So you could skip modelling and become a Vue specialist instead for example. I used it a few years ago because the job I worked on required a Jungle. It was brilliant and the results were far superior to something I could have modelled manually in the same time frame and I only touched the surface of what it could really do.
Anyway,
So, to get an understanding of basic modelling. Install a free package and create something like your Mac Monitor or a lamp. This would give you the starting fundamentals of modelling. Now, if you go and watch modelling tutorials on youtube for C4D, Maya, Modo etc you will have a greater understanding of what is going on in comparison to your own experience and you haven't spent a penny yet.
Another way to find out what industry consider key software tools to use would be to look at university courses and see what their preferred packages are. After all they are driven by industry demand.
Anim
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Never tried, but if you can somehow get a mesh to me in obj format, I'm willig to test it.
I wish I could, its all NDA stuff. I might be able to find something on the net though. Let me look, cheers.