Congrats on your Mac! Once you go Mac, you never go back! I keep all my actions in the Actions folder in Photoshop presets. This way they're accessible from my actions palette dropdown. When I'm not using the action I just drag it to the palette trash to keep the palette from getting bogged down. It still says in the dropdown menu. I install fonts in Font Book. Macs can use any True Type or Open Type font. Font Book makes it really easy to manage your fonts and enable/disable them.
Have fun!
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