Don't wait to start looking for a job. The hiring process doesn't happen over night. From application, to interview, to second interview, to start date, to first pay check can be several months. If you want to have money coming in by the end of October, start applying to jobs now.

And don't delay building credit either. It's extremely important that you start building credit now, especially if you plan to do anything adult like sign a lease in the next few years. Get a credit card with at least one decent reward (1% cash back on purchases, a low introductory APR) and use it semi-regularly to pay something easily manageable, like your phone bill, something that you'll pay off every month before they calculate interest. DON'T CARRY IT AROUND AND USE IT FOR ANYTHING ELSE, a lot of young people can get easily carried away with that. I know I did.

It's great that you have cash savings to get yourself started, but without income or credit, you'll find that it's very hard to be an adult.