I fucking wish I had anything that I did back in like 2001 when I "started" getting into "recording". It was the same as you - Guitar -> amp ->Line/Headphone Out ->Line in of computer
Recorded with Windows Sound Recorder and Tabit for drums.
First "full" mix was a Lamb of God - "11th Hour" cover.....just fizzy guitars and drums.....but back then I was so proud of it.
Here I am, 10 years later, still haven't made a single dollar off recording, and unfortunately practicing mixing less and less these days.
I still have my first record (2006) LOL, doest sound so bad as yours 1st. (I had a beringher mini desk and a MAYA interface), so i kind eqd and fx. Sounds like shit though