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Lynda.com is one of the best sites where you can watch or download tutorial videos at a price. If you have a LinkedIn Premium account, you can make use of this service for free.
First of all ... did you paid for the program or do you just want a freebee?
If you purchased it there are specific instructions to download it and install it including the load keys.
Otherwise check with AutoDesk.com
You also can call them and check if there is a licens available for an employee ... ( I think they are called Home versions) you have to furnish a load key from your company and this license will be issued in your name ... a full version will be send to you ... at least that is how I got my Microstation software and license
Below is link to download AutoDesk software from original web. But you need to purchase it after days trail.
http://autodesk.creativevirtual.com
OR
there are plenty of them, just google it
Just search on google. http://www.autodesk.com/education/free-software/autocad you can use
From Autodesk Website. You have a trial version valid for 30 days afterwards you hve to buy it
Autocad 2013 can download from Autodesk official site, but the latest one is 2016.
MANY OF AUTOCAD VERSIONS HAVE INSTALLED FROM THE WEB SITE : SHARE LINK.COM
You can purchase the software online from Autodesk, download the software and install.
You can even find very good tutorials in Autodesk website itself. Otherwise google also comes very handy for tutorials.