It might help if you could tell us where you're from? Are you completely sure that it's illegal to invest in cryptocurrency for individuals, usually regulations like that are targeted against financial institutions.
If it is indeed illegal, I wouldn't really recommend breaking the law, but if you do, at least check beforehand what the consequences would be if you get caught.

As for tips, I'd suggest you first learn how cryptocurrency works by downloading a wallet and sending a couple of transactions to yourself.
Afterwards you can find tutorials about trading and how to use exchanges for day-trading.