What Precautions To Be Taken To Increase The Chances Of Implantation And Pregnancy?

Hello doc, I did a follicle study last month where one of the follicles ruptured after an injection.Unfortunately I got my periods that month and the doctor did another follicle study this month too with the same medications and injection to rupture the follicle. The results revealed that one follicles present and ruptured.the other one not yet ruptured. My both tubes are well. In First folliculer study My right follicle present & then ruptured. & 2nd follicular study my left follicle present & then reptured. My doctor suggest for IUI treatment. My Question is 1. What happens beyond this in the cycle? 2.What other problems can there be for me not to conceive even after follicles have ruptured? 3. Does only one follicle fertilize in the end? 4. What precautions to take to increase the chances of implantation and pregnancy? 5. what happens if the egg that is released does not get fertilised 2nd follicle does not rupture? 6. Shall i do IUI treatment & how many chances in this treatment for Pregnancy? Please Help. Thanks