There are 12 books which came out between 1994 and 1998. 11 of the books follow Jake and Nog having there own adventures, and there is tie into the Day of Honor stuff that focuses on Alexander Rozhenko. I read them as they were coming out, and as a kid at around the age group the novels were targeted at I loved them. Same goes for all three SFA series that came out at the same time. If you don't know about those, there are 14 TNG novels, with 3 focusing on Worf, 2 focusing on Geordi, 2 on Data, 2 on Picard, 1 on Beverly and Data, 1 on Will Riker and Geordi, 1 on Deanna, 1 more on Geordi, and 1 more on Data. There are 3 Voyager SFA novels, focusing on Janeway, and 3 TOS SFA novel, one of these focuses on Spock, the second one then adds McCoy, and the thirds puts the whole Trio together by adding Kirk to the mix.