When installing windows select the SSD and install to that. Once done you update drivers ect for your machine. Now anytime you want to install a game ect just select the install path to go to the other drive eg D:\Games\<game name> (C:\ is you main OS drive). Install Antivirus and Spyware ect to your main drive (c:\). Anything you install will give you a promt of where you want to install it, usually C:\Program Files, just change it to D:\ (or whatever letter is assigned to the HDD).
Im not sure what you mean by storage but if its just Pics films ect but no installs ignore above. You dont need to partition the Hard drive unless you want to split it for some reason.