Before I start answering a newbie question, I always like to look at their posting history first.
And guess what I saw in yours?
I have $1000US that I want to convert into Bitcoin so that I can buy something using Bitcoins. HOW?

?
"I have $xxx dollars in US currency in my hand. How do I convert that to bitcoins?"
VERY CONFUSING. I have $500US that I want to convert to bitcoin. HOW?
Yeah, so you're not really interested in getting bitcoins, so I'm going to answer you with a counter-question: What are you really looking for here?