Question for you guys...

I’m looking to get into music. I feel like I was born to perform, or at least make YouTube/Instagram videos - but I’m always nervous with stage freight so I haven’t really ever sang in front of people. Nothing inspires me more it makes me happier than when I’m just really feeling the music i listen to, while driving along and just singing my little heart out

I’m looking to record myself, maybe do some covers, but I’m at a loss for where to even begin

Any good beginner software/programs to enhance audio and mix myself to sound as good as possible?

Additionally - I’d love to just mash up a ton of my favorite songs. Any recommended programs simply for just cutting and pasting songs together to make into a single song?

Sorry... I know I’m all over the place... TIA!