Basically, the formats for these courses are multimedia online presentations with an extra text format for those so inclined not to use the bells and whistles. There is also the ability to download the entire course and take it at home. I was able to place a few courses on my own CD and used an .html page to link to them. Both of these courses can be downloaded and studied, but you must take the completion exam online. Website registration is required at UCAR.edu to track progress, complete surveys and obtain a completion certificate from the website. Speaking of online surveys, I normally find my course completion certificates for download after completing a course survey, but there may be an email option for completion documentation.
I agree that ground loops can be a big factor to fight with. Using a single star point as a kind of intersystem or interdevice bonding point may be helpful to avoid such grounding loops. Haing a direct connection to the chassis ground or to battery ground from such a star point should cut down on interference as well. Keeping the grounding runs to a minimum required length would also be a good idea so as to un-invite any potential intruders.
If you are doing any computing in your shack, I would suggest wiring some good RH-45 cable to support your local area network. Avoid the 10/100 gear and use stuff rated for 1000 Mbps or higher. This might be your best opportunity to have it in place for stability of network and internet.