Well pably15 that's quite the question! I could probably write a book about it. Before leaving school, I already had worked several temporary/part time jobs from about age 12, in for instance, a deli, a bookshop, a ladies boutique, Woolco!, a petrol station, a cafe, a gents outfitter (a male person had to do the inside leg measuring!), an ice cream van and so on.
At school I was a bit of a rebel and the headmaster didn't like me belted me . I dogged school a lot (no wonder), went to venues meant for folks older than myself, radio shows (Electric Gardens) and the like. I did OK though academically, and my first 'proper' job I brought home about £5 a week - mum took half for my keep ("after all you've had enough out of us!")
I loved to go to the local discos and dancing, and then I learned to drive. Off I went! Exploring, fun, fun. Went to see bands, discos and so on. Throughout these years I was also involved with horses and, not to mention a boyfriend or two. 
After failing to be accepted to train as a Social Worker, I decided to train as a Riding Instructor instead (bad mistake - very poorly paid profession and hard physical work although I loved it). I am still paying the price of pain after a physical life with horses although I retrained in a completely different subject later in life.
I recently found one of those little brown envelopes you mentioned pably my mum had kept it with my wage slip within.