I'm on my phone but that sounds about right. I guess you are downloading programs as well as drivers. The drivers should be marked separately to programs. If they are all listed for your motherboard download them all and try the programs, uninstall if they are not useful
Well I'd say no, unless you have problems with your PC leave the BIOS alone. Updating the BIOS is easy but it's also higher risk, if it goes wrong it can kill the motherboard so only do it if it's to fix a problem.