Heyhey!! I'm new at this too! My husband and I started TTC early this month and it has been so incredibly exciting I feel like I am bouncing around like a little kid on Christmas all the time!!!!
For ovulation, there are apps that you can download on your phone that you put in your period length, how long your cycles are, etc, and it will tell you your ovulation dates. I did a ton of research and noticing discharge (TMI but after bowel movements were the best for me) is a huge indicator of ovulation. You're looking for that egg white stickiness! Mine started a little thick, not sticky, and then as the days progressed I got super sticky and almost clear
I'm not sure about the coil and how that effects periods, though!