My husband bought me a iMac G5 for Christmas and I'm sure I'll love it--someday! Right now, however, I'm just frustrated and confused!

Can anyone tell me if all the fonts I've downloaded over the years in Windows can be downloaded to my new Mac--in other words can the font extensions be read by both window and Mac operating systems.

And if so, where do I download them on the Mac. I've found my presets and plug-ins folder in my PSE for Mac application but I'm clueless on the fonts! Same question goes on actions--are photoshop actions from places such as photoblast.com compatible on the Mac?
Thank you!
Debbie57