the best way to become rich is to start a small business which sells something unique or which offers a unique type of item which will be known to sell OR somehow find a way to sell a very popular item for a lower price thereby getting a large customer base quickly.

It may be possible to become rich using online methods but it requires time and lots of dedication. So you'll have to focus on 1 only, not both but doing the online as a part time is possible once you get ur main business up and running.