Is this a firewall where I don't have to interact too much, because I'm not a computer tech?
Online Armor tries to limit the amount of popups that ask you for decisions. Outpost is also good for a quiet firewall. Although, avast's is completely silent.
Just that reviews and comments I read are that it really isn't a very GOOD firewall. One comment was that it offers about the same protection as the Windows firewall.
Don't know where you heard that, but according to pcmag.com's review
here, avast's firewall is actually better than most other suites' firewalls. It makes your computer invisible to hackers, makes its own program control decisions so you don't have to, and blocks/identifies exploits. IMO, you should use Comodo with D+ disabled if you want no popups, Online Armor, or Outpost, if you really don't want to go with avast. These are all pretty quiet.