The best electronic decision I made in 2007 was to see the Light and join the Temple of Steven Jobs 😀
With TV just be aware that a hardware update/upgrade is well overdue. See this thread: Rumor Suggests New Apple TV 4K With A12X Chip is 'Ready to Ship' which was last updated September 22, 2017.
If you buy a desktop/laptop product then PLEASE please buy an external drive and activate their incorporated backup program called Time Machine. This has saved my nuts lots of times, including just today for a missing file.
As well iCloud is a must if you have multiple iDevices & mac's and you want to keep important data sync'd: e.g. Contacts, Passwords, Photo's, Calendar and a few more.
Their are plenty of techies in these forums for all your questions.