This game will definitely sell well.
I'd say, if you put up the thousand yen bill for online auction, it would easily sell for five hundred yen.
I will teach you how to write novels that sell.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means sell, so the verb version is to sell or to be sold.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading already, so you should be able to read it!