New! Lots of questions?

Marina • 24. One Son💙 We want one more(:
My boyfriend and I decided we would like to try to get pregnant for the first time. And I have lots of questions! 
1. I'm over weight for my height, will that make it harder for me to get pregnant. I'm currently trying to lose the weight. 
2. I have been on birth control for my irregular periods, I'm curious how that will affect me. 
3. Any tips on how to speed the process along and increases chances. 
Thanks you