if you decide to buy it through Coinbase, it's probably best if you transfer it right out of there and into a safe wallet.
Can you elaborate on what you mean by "it's probably best if you transfer it right out of there and into a safe wallet"? Is Coinbase unsafe for some reason?
Don't know about Coinbase specifically, but in general leaving your money with some small company in a jurisdiction you may or may not share is not a very safe idea. In fact, I'm pretty sure trusting third parties with their funds accounts for the majority of BTC lost by Bitcoin users.