First paid sign was done when I was in art school, it was a 3'x4' double sider, customer provided painted plywood.
I got $50 and it took about 4 hours! I thought I was hot sh!t.
But even in Kindergarten kids would get me to draw stuff for them, and I did a lot of art for people all through school. Including a nude lady on someone's jean jacket.
Also won a lot of paying contests from painted Christmas windows to stuff for the newspaper.
Funny thing is, that first client still uses the sign, it was a FOR RENT one.
It's butt ugly, I have a pic somewhere.
That was in 1980.
Love...Jill