The best way to start mining Ethereum involves the following steps:
Join the Ethereum community through forums such as Reddit and learn as much as you can. Always remember to do your own research (DYOR). Invest in the correct mining equipment. AMD and Nvidia GPU cards are the more popular options when it comes to mining Ethereum. Join a reputable mining pool such as Ethermine, F2Pool, or NanoPool.  Create an exchange account (in case you need to trade your coins).