starting now is harder than if you did 20 years ago.
old CPU architecture were easier, software had more vulnerabilities, etc.
now almost everything is well protected and you need to know very well their architecture and language on a low level (memory bank access or each chipset memory, etc.) to find flaws in hardware, more than software.
Learning software development language is also needed to apply and test your exploit idea to the found vulnerability. C/java/python and also low level (ASM) for each CPU architecture is required.
it might not be funny to go back to old consoles, but it could give experience for future ones.
you could also check previous CCC conferences of Wii/PS3/
3DS hacking just to get an idea of what and how it has been done. you don't really search, you need to understand how it works and see a flaw in how it's done and how you could abuse it.
There's also this write up about
fusée gelée for switch by Kate Tempkin.
just for fun and give you an idea.