@BillS
Hi!
You're not telling us what kind of Amiga you have! What version of Workbench are you running?
From Workbench 3.0 and up your Amiga can read MS-DOS formatted disks (from your PC), although they would have to be 720kB DD disks. Only the A4000 can read 1.44MB HD disks.
Saving your images as IFF files in Photoshop shouldn't really be needed. All modern Amiga graphics programs today can handle GIF, PNG and in most cases JPEG.
Personal Paint, which is freely available from Aminet, handles PNG files perfectly. If you have a graphics card you might want to take a look at PerfectPaint, also for free on Aminet.
You can also convert most formats to IFF on your Amiga using GfxCon from Aminet.
I'm telling you this because IFF files tend to get rather big, especially in 24-bit format, so it's a tedious process transferring them from one computer to another.
