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In answer to both your questions:
1.) Opening a new business (online or otherwise): In my state (NV), I needed a business license and was advised by my attorney to form a limited partnership, so I did both. In addition, I used services from Go Daddy to set up a website and from FedEx to print business cards. While my business (3D scanning, printing and training) is not online, I use a variety of online services. You can see more at www.clarketec.com.
2.) Computer literacy skills: In addition to general use of the Internet, you should probably have some familiarity with spreadsheets such as MS Excel and word processors such as MS Word. Other skills can be picked up at your local community college as the need arises.
Hope this helps and good luck.
P.S. 52 is young. I took the first of my 5 retirements at age 52. I'm now 77 and having the time of my life.