The amazing thing about Bitcoins is that it’s a currency, or a medium of exchange, it can be exchanged for goods and services, and it has an exchange rate, like any other currency.
So, "to start" with Bitcoin , you'll want to either buy some bitcoins, or, more likely, accept Bitcoin as a form of payment for your goods and/or services.

This topic has some suggestions on how to earn bitcoins: [General] How to earn Bitcoins
The rest is up to you and depends on your abilities and what you're good at.