Tips on ttc i have lots of questions new to this

I recently have started ttc i been with my husband for 5 years and never really tried but also was no preventing it and i have only gotten pregnant once in the whole 5 years but unfortunately ended in a miscarriage very early on. So now i just started getting into really ttc and asking myself why I hadn’t gotten pregnant. Am pretty new at this so i dont know where to being in our journey of ttc. When i had the miscarriage they didnt say anything about something being wrong with me they just said everything look normal after the miscarriage had passed but now 2 years have gone by and we are ready to start conceiving. Im looking for tips on ttc “what should i ask my doctor” , “what diet should i do” , “what treatment should i start with”? My period are pretty regular i have one every month and can predict the next one thats how regular they are. I just started taking the rainbow light prenatal for ttc. Should i get my husband to go to the doctor to get tested or should i just go for now... any tips and advice are welcome thank you 😊