You can try your local library. Libraries often have a wide selection of novels, including those by Jackie Collins, and you can borrow them for free. Just visit your nearest library branch and ask the librarian for help in finding her books on the shelves.
Occasionally, an author's official website or the official website of the publisher might offer a freebie, like a short story or an excerpt from a Jackie Collins novel. It's not common for a full - length novel to be free on these sites, but it's still worth checking. Also, some literary blogs might run giveaways or promotions where you can win a free copy of a Jackie Collins novel.
Perhaps they were introduced to it by a friend. A friend might have shared a really interesting fanfiction piece with them, and from there, they got hooked.
There's not enough given to precisely define who Jackie Ryan is in 'black jack the jackie ryan story'. She might be an ordinary person who gets involved in extraordinary events related to 'black jack'. Maybe she's a gambler if 'black jack' refers to the card game, or she could be someone who has a symbolic connection to the concept of 'black jack' in a more abstract story.
Eric and Jackie might love fanfiction because it allows them to explore different universes and storylines. Fanfiction often takes existing characters and settings and twists them in new and exciting ways.