New iMac Peripherals Attachment Questions

My new iMac arrives Wed. this week and I have a few questions. First of all the details:

27 inches
Screen Resolution 5120 x 2880
Max Screen Resolution 5120 x 2880
Processor 3.5 GHz Intel Core i5
RAM 8 GB DDR3
Memory Speed 1600 MHz
Hard Drive 1 TB
Number of USB 3.0 Ports 4
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Other Technical Details
Brand Name Apple
Series Apple iMac 27" Retina 5K
Item model number MF886LL/A
Hardware Platform Mac
Operating System Mac OS X Yosemite
Item Weight 21 pounds
Color Silver
Processor Brand Intel
Computer Memory Type SDRAM
Audio-out Ports (#) 1

I had read somewhere while researching that people had had problems when they plugged all their peripherals in at the same time. I didn't intend to do that but plug them in only when I needed to use them. Some of them are an Epson Perfection 750 Pro scanner, Epson Pro R2400 Photo Printer and a few back up devices. There is also the Klipsch stereo system but that is not a problem I wouldn't think.

Just wondering if I have covered the bases or if there are any suggestions concerning hardware that I have listed. The old Mac Pro finds drivers by itself and I would assume that this mac will also though I can easily look them up and install them as I need to. My first new computer in almost 8 years and I just want to cover my bases. TCrowe

 

Just making sure as it's been a while since my Mac Pro purchase. I asked because I couldn't envision those problems but, what do I know. Thanks. I will get it buzzing just as quickly as possible.