@Quincy has already linked you to the post on how to contact Airbnb
More generally, I would say just like when you set up any other business, doing your research will pay dividends.
You will find 99% of your questions answered by either using Airbnb's Help Centre, or the Community Forums - where hosts like myself provide help and advice on a voluntary basis to help out other hosts. Just use the search function for the topic you are interested in.
You can also read up on they useful tutorials and guides on these pages.
I can't imagine it would take you two days to search for the answers for simple questions 🙂
If you can't find an answer using the search functions, just post on here and someone will normally be along shortly with an answer.