If I was you I would look into Lycoris Desktop LX
I know that Slack is fast, but honestly it sounds like you might need a distro which is that hands on yet.
but if you insist I'm at your service:
First check the PET (top of the screen the "menubar" and you'll find both my original PET on software mangement and Feztaa' (he uses another program to get the job done)
For the file tree, look at our member NGene's website
she has some great guides on there.
As for a fast first timer Linux, I would go with Redhat, or lycoris - Redhat if you need a desktop and a playground, Lycoris if you need Windows but want Linux (it has no compiling suits, no nothing - it's a great Linux for the average Windows user)