No problem, I'm glad I can help
For the scanning, I think that once a month is enough. I rarely scan my computer. Avast is more focused on prevention, so if you keep all the real-time shields+firewall on, leave auto updates on, and sandbox your browser, you shouldn't have any problems.
Also, if you are downloading stuff from the internet frequently, it is a good idea to sandbox suspicious files that you think may contain viruses. You can run/scan the program inside the sandbox to determine whether or not it is safe while remaining completely protected against any malicious actions that it may try to carry out. If it's clean, it'll be safe to download them again, but to your computer. By default you download things directly to your system. To make downloads go into the sandbox, go to Real-Time Shields>Process Virtualization>Expert Settings and uncheck the first option "Automatically detect safe locations and exclude them form virtualization." Check it again for normal downloading.
I hope this advice helps