Can someone help

Can someone talk me through the whole process of being pregnant please?? First time and no idea what I’m doing or what to do. I’ve called the midwifes office and they’re sending a letter out? That’s all she said I have no idea what it will say or what it’s about? I haven’t had any appointments with anyone yet or anything and have no clue how far on I am. I’m in the uk if that makes a difference. Thanks