Fertility boost supplements?

My husband and I are TTC!! Finally after 7 ½ years together, we just got married on June 15th. We decided (his idea to start, I've been ready for a few years now) to start our journey to baby number one! My cycles are irregular, but I've been tracking ovulation for a few months now. We'd like to start taking some supplements to boost our chances of conceiving sooner rather than later. We both already take a multi vitamin, and eat a relatively balanced diet.

I guess my question is, what are some of the best supplements to take? Will a prenatal work for me? What should he take? He works in the oil field and I'm worried about the chemicals he is exposed to having a negative effect on him. Should we both take folate? Ive done some research but. I'm still new to this. Thank you in advance!