@Amber-Rose1 I think one really important thing is to just be yourself. There's no special way a host has to act, and it will indeed make you nervous if you're stressed out about how to be with guests, what they will think of you and your place, how they will review, whether you've made it nice enough, etc.
We all have different personalities- I'm sure there's some hosts who are stand-offish and businesslike with their guests, but as I host a room in my home, I've been pretty casual with my guests from the get-go. While I make sure their room and bathroom are super clean and comfy and they have everything there I think they'll need, and make sure the kitchen, which they share with me, is clean and the property is as presentable as possible, I don't get stressed about it- if there's a pile of plant cuttings in the yard I haven't gotten around to removing, and piles of leaves that need raking, so be it. If I haven't gotten around to washing my dishes, I apologize for the mess, but don't get frantic- there's plenty of clean counter space for guests to use and I will get around to my dishes at some point that day. No guest has seemed to care at all.
I've always just regarded guests as some long-lost cousin who came to visit. It also seems to put them at ease. If they seem to want to sit and chat, I'm happy to oblige, if they seem to want to keep to themselves and be private, I go with that flow as well.
Don't worry- you'll do fine. You probably wouldn't have gone into this venture if you didn't think it would suit you. And it's impressive that you've actually spend time making sure all is organized and you are ready to host before going live with a listing- that bodes well for you. I see posts here all the time from people who've put up a listing without even knowing how they get paid, the difference between an Inquiry and a Booking Request, have awful photos, in other words, they were only thinking that it would be a good way to make some money, but didn't bother to do any homework.
And keep reading these forums- it's a great place to come for general info, help, support, and commiseration when things get difficult. And there's a lot of humor here as well, something we all need good dose of when dealing with all the various, sometimes odd, guests we deal with.