I was wondering if you could provide me information about some good sources on Old Earth Creationism and perhaps also some key biblical texts supporting thus.The answer to this question is too large to tackle in this format. But I have written an entire study guide which addresses it, The Bigger Picture on Creation available through Reasons To Believe. This is an inductive Bible study which will allow you to weigh the textual evidence for yourself.
Also, if you visit the "Age of the Earth Resources" page (see above), you'll find many links to books, videos and articles on the topic. I would recommend starting with my friend, Jack Collins' book, Science & Faith.