Quoting Jessica Elaine Collins:" So my husband and I decided we wanted to try and have a baby. I have a child from a previous relationship, ... [snip!] ... testing and find out for sure when I start to ovulate. Any tips and suggestions would be greatly appreciated! Thanks ladies!"
You can start charting on mymonthlycycle.com and it even has a additional site called when my baby- and you can put your last AF in and it will calculate when you O and when you can start testing. I really like the site, I've been using it for years. Also, if you want to try additional items you can use the OPKs and you can get them at the $ store and test with those around O time. Also, you can start using a BBT Themometer and take your temp every morning before you get out of bed and chart on a graph and when your temp drops then that means you will be O. Also there are other things you can do to help as well, but your just starting so I would start with that first