Questions because I feel like I'm losing my mind

I've been so caught up in the idea of us trying my mind has been racing with a million questions along with all this anxiety/nervousness/excitement. I was 6 weeks pregnant in December when we found out I miscarried. We are now TTC and I have a million questions because I feel like I want to do this right (which I know  I shouldn't be overthinking this) AF came to town on Sunday and is just wrapping up when is the best time to try? And how often? Also should I be taking prenatal vitamins? Any help with all this would be awesommmmmmeeeee