Just about to TTC... Scared!

Hi! Me and my OH have wanted to start a family for quite a while now (since our nephew arrived almost a year ago... Broody much) but the time was never right. BUT he has just got a permanent job which puts us in much better position. He wants to start officially trying when we go on holiday in 10 weeks time (as he has it in his head we will fall straight away and he doesn't want me sick on the plane 😂)... However I have this awful feeling it will be a long hard journey for us. I was always very irregular, I came off BC (pill) just before Christmas after 7 years using it and I have been irregular/long cycles (40 day mark) since. I want to start trying ASAP. Is anyone else in a similar situation? Any advice or tips for beginning to TTC? We are both healthy, non smokers and don't drink that much. Any advice or support would be welcomed as frankly I'm bricking it 😂