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If you're zoned for it you could start a nursery. No, selling poison is not a legitimate business model. No, touching poisonous plants won't generally kill you unless you have some kind of allergy. You can get some minor toxicity, maybe some tingling in your fingers or heart palpitations. Yes, poisonous plants were used for medicine. Effects like numbness and nausea can, in the right doses, serves as things like analgesics and emetics. Doses can vary greatly though and are hard to control so accidental poisonings are common in these applications.
Grow them for fun or grow them for other people's fun. That's about it.