@njhswifi You can easily search up tutorials that explain better than I do, but let me try.
[1.] Adding PSDs
You have to drag the psd file into photoshop, but make sure it's a different window than the graphic you're working on. I like to pull my graphic out of the prescribed square, so that I can easily drop the psd behind it. Then, you have to take the adjustments from the psd file, and drag them onto your graphic. Don't take the photo, just the adjustments, which are usually in a folder.
[2.] Adding Fonts
You have to download them, and then you have to install them. Once installed, they should automatically show up in Photoshop!