Congrats! There are not a lot of tips I can give, just sit back and enjoy the wait! My first clutch was laid 8 months ago and I am still waiting for something to happen. Take advantage of the time and ensure that you are ready for the hatchlings.
Not necessarily, but they could. I could tell which eggs were infertile right off the bat, though I still kept them in with the other eggs until they molded or shriveled. None of mine molded, but all of the infertile eggs shriveled away in a few weeks.