I want to make some business cards... Can I use the ones that say commercial use?

Or personal use?

pick your font, read the license agreement.

Where is the license agreement for each font?

Most times in a text file that comes with the font. Nowadays it is often incorporated in the font itself (font properties > license/copyright/names). Older fonts often don't have that info as they stem from the days when everybody understood what 'free for personal use' meant and there were no smart discussions of how to interpret that in such a way that it can be used commercially in a sneaky way. But then, those were the times of Bob Dylen. And as he sang, the times they are changing ...

edited for typo. kk

Many have a text file include in the zip file with the conditions of use.

Didn't I say that already?