You don't import fonts into InDesign. InDesign will recognize all the fonts installed on your computer (Mac or Windows). To add new fonts, you would install them on your computer.
To select a font which you've installed, you would select it from the Font menu found on the Control panel at the top of the page. You'll see the option to select a font when you have the Type tool selected in a text frame.
It sounds like you need a good introduction to the basics. I recommend Sandee Cohen's excellent InDesign CS5 QuickStart, available from Peachpit Press and Amazon.com. It's less than $20 and would save you a lot of time learning. You can also look at videos on www.lynda.com.
Thank you do that