You can use the "Advanced Search" feature in the upper right-hand corner of the OverDrive catalog to search for items in a specific format or age level. Limiters like "Children", "Juvenile", "Teen", or "Young Adult" can be combined with a number of genres for searching.
Titles you download through OverDrive have a 21-day checkout period, the same as physical items, but for some eBook titles (depending on the format), you may choose a shorter checkout period --- 3, 5, 7, or 14 days.
From your description of "books that read the story & have color pictures", it sounds like the selections available through Tumblebooks may be of interest to you. Tumblebooks has electronic read-along storybooks that are read to you from your computer. You can access Tumblebooks from a link on this webpage. Tumblebooks cannot be downloaded to an ereader.
