A lightweight distro would be best.
It won't have the fanciest desktop interface but will be still look fine and be easy to use.
You can look through the ones in this list. Any of them will be more than lightweight enough for your specs.
Pick the one you seem to like the best.
https
/fossbytes.com/best-lightweight-linux-distros/
Everyone is going to have their own opinion as to which distro is the "best" but since you're a complete newb to linux, I would recommend just starting off with Ubuntu Mate since Ubuntu will give you it's own applications management repository that's easy to understand and use.
Think of it like an app store for your PC.