@Patricia867
Hi -well done on getting your first guest. They won't know and I wouldn't tell them - but remember they will be just as nervous as you (particularly if they are sharing your home).
If they are there for a few days then you do not go into their room, and neither is there any need to clean or tidy up their room. If they are staying for more than, say 4 days, a change of towels should be offered and a change of bed linen after a week.
Some guests are happy to chat and others just want to be by themselves - so don;t worry about it, just go with the flow. Be friendly and welcoming, show them around and point out anything that is particularly important to you (eg locking the door).
Let them know that you are around if they need any help or advice...
I am sure you will be fine.....
In terms of feedback you can, in the private comments section, tell them afterwards that it was your first time hosting, so if there was anything different you should have done that would have improved their stay, then ask them to let you know.
Good luck