Hey there, ImmortalGiraffe.
I assume that you already have Windows installed on your SSD (please correct me if I'm wrong). If this is the case, from here on, it's really easy. All you have to do, is to choose the path you want to install your programs/games to when prompted to do that, instead of going for the default location which usually is "C:\Program Files". E.g. if you have a folder for your games on your HDD and the hard drive's partition is D:, you can choose the installation to go to D:\Games\Skyrim (if you are installing Skyrim for example). This way the game will be installed on your HDD. As for files, which you download, you just have to adjust the settings for the browser's (and/or the program you're using to download stuff) default save location, to a folder on your HDD.
There's an option for you to move your user folders to a different drive, but I won't get in much detail about that (unless you'd like to try it) as it may lead to possible complications if you try to upgrade to Windows 10 at some point.
Hope that helps. Please let me know how everything goes and if you have any questions.
Boogieman_WD