Should I flop and if so how

I want to start flipping pc I thought it would be a cool way to make a bit of money for a school trip coming up next year. I was wondering if anyone has advice about what to use where to order. And how much should my first build cost

Extra details I’m from the USA I do have a micro center near me but it’s about an hour away I have about 600 to start I’m still in school and I do sports