How do you structure monetary phrases in Japanese?

I know that "yen" in English is pronounced "en" in Japanese and "o-kane" is a formal way of saying "money", but I've been looking around all day and kept getting gibberish. I need to figure out how to phrase monetary statements in Japanese for work; do you say the decimal/dollar value first, which order is each part spoken in, and when/if "en" is in the phrase (also when it is necessary). Any help would be appreciated.