Awesome! Linux Mint's welcome page should have given you directions to setting up the built in firewall. If you really want an antivirus, ClamAV is a good one for Linux. However, whether you need one on Linux is actually a complicated question: https://forums.linuxmint.com/viewtopic.php?t=358408
Really depends on your use case, at the end of the day. Good luck, and let us know if you have any questions!
Looks like you needed to actually @ the bot, but here's your late reminder. Unfortunately Loops got postponed about a week due to Meta being a-holes and naming a different thing Loops, but they should hopefully be up next Sunday.