How to start trading Bitcoin with Kraken exchange?

There are different verification requirements for the different verification levels, as described below,

• Starter (low limits)

-Full Name
-Email address
-Primary address
-Phone number

• Intermediate (higher limits)

-Occupation
-Government issued ID (Passport, Drivers License, National identity card) 
-Proof of residence (Bank statement, Credit card statement, utility bill, payroll statement, insurance statement, tax document, residence certificate)

• Pro (highest limits)

-AML verification
-Financial statements

Source: https://www.cryptocointrade.com/crypto-trading-blog/how-to-start-trading-bitcoin-with-kraken-exchange/