Don't forget to look on eBay. I'd suggest you start with a baler, even a small baler will pay off in storage space. We bought a baler on eBay for $700, a top loader. With it, we can actually cancel our dumpster because we can now stack and store plastic and cardboard until we're ready to sell. Paid for itself in savings in under 4 months.
I think your goal sounds like a plan to ramp up into new things, always a good plan to diversify. Just know that sorting plastics is a HUGE part of the job, and you'll need space, and someone with plastics knowledge as you get started.
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