TTC! Ready for a baby!

okay so my fiance and I are trying to have a baby, we have been rogether for 2 years and we are ready! we are still young but we ome want soon becase Ill be infertile in a few years. im trying to figure out the fastest way to make it possible, would once a month when im having my most fertile days be enough sex or no? please help! Any tips or tricks thay anyone has please share!! Thank you!