The issue here with breeding is that there is no timeline between lock and ovulation or lock and egg laying.
Their will be hints along the way to look for however the only real timeline will start at ovulation itself.
Some females may lock and not take at all, some may lock not take and the following season without being paired lay a clutch of eggs (sperm retention)
Now to come back on the signs to look for, you need to look for change in behavior has follicles grow the female will chose the cool end of her enclosure, you will also notice your female building up (a lot of new breeder tend to mistake that with ovulation) and you will notice the glow.
Now as far as ovulation it will be unmistakable the female will appear as if she swallowed a football from that very day the real countdown to eggs will start. It will be about 14 days to pre-lay shed and from pre-lay shed to egg laying it will be about 30 days...............of course it's an average the length of time between ovy to eggs could be shorter by a few days but in most cases it will be a bit longer (depends on the female itself and your husbandry)
This is a great guide for beginners http://ballpython.ca/gallery/breeding/, it will help you understand what to look for.