Obtaining bitcoins works just like obtaining any other currency. You can sell something you already have for them. You can ask your existing employer to pay you in Bitcoin. You can use a Bitcoin based payroll service like Bitwage without your existing employer even needing to know. You can start accepting them as payment at your current business. But the easiest way is simply to buy them on one of our trusted Bitcoin exchanges.

This site is really good for a comparison of Bitcoin Exchanges...

We heavily advise that you do not buy bitcoin directly from someone you meet online, unless you know them very well or can meet them in person. Quite often one of our team does meet up with someone and purchase bitcoin direct by paying cash. The transaction occurs immediately and bitcoin are sent to a direct wallet immediately, but this relationship has been built over time with trust.

There are other ways you can earn bitcoin, through traffic exchanges, HYIPS (Risky), or completing surveys. Ask your sponsor for more information on this