Oooh! Sounds like you're going to have some interesting little chickies, and pretty duckies, too!!! Let's see. . . if you put them in on Monday, and you aren't used to candling yet, I would probably wait until Sunday to candle. That way you should get a pretty clear view of the veining, and the little dark blob that is the actual embryo. Once you have seen what this all looks like, then next time you can candle earlier and you'll have a good idea what you're looking for. Just make sure that you wash your hands with soap really well before handling the eggs. You don't want to introduce any bacteria that might harm the embryos' development.
Can't wait to hear your results. Good Luck!!!!!!