Step One: Choose an Exchange
Signing up for a cryptocurrency exchange will allow you to buy, sell, and hold cryptocurrency. It is generally best practice to use an exchange that allows its users to also withdrawal their crypto to their own personal wallet for safer keeping. There are many exchanges and brokerage platforms that do not allow this. For those looking to consistently trade Bitcoin or other cryptocurrencies AS.EXCHANGE is the place you are looking for.
AS.EXCHANGE is not a best place for that. It didn't been launched yet, so we can't say that's best place for OP. Instead of that exchange, i would recommend Binance exchange as best and biggest exchange site for now, it has very huge traffic compared other exchange. Their daily volume even surpassed $30billion. You don't even do KYC because their daily limit withdraw is 2 btc without KYC.
OP, there is bitcoin and that's bitcoin. Don't fall to scam which saying they have bunch of bitcoin, it's obviously trying to scam you