1) If you see visible, formed eggs it is too late for that clutch. The mating must take place prior to ovulation. If she mates now she will still produce viable eggs the rest of the season. I would keep this first clutch anyway because they may be fertilized from last year. That's a big maybe but it does happen.
2) If they bred successfully you can seperate them but it is a good idea to repeat the intro several times. In my experience the females are most receptive approx. 24-48 hours after egg laying and I place them with the male at that time. This is not entirely neccessary though as I have had several females lay fertile eggs all season from one mating.
3) After ovulation it takes anywhere from 2-4 weeks to lay the eggs. My records show an average of 18.5 days. Each female is different and usually very predictable if you keep good records and maintain steady temperatures.
4) Raised tail wagging by the female is a warning to stay away. She is telling the male to back off. She probably isn't ready yet. Keep introducing them until you witness a successful breeding.
Good Luck!
John Yezbak

North Coast Geckos