Hi Marie,
Welcome to hosting - it's a steep learning curve! The lightening strike at the top of your listing means it's "Instant Book" - guests can book a confirmed reservation without approval from you. You can find out how to turn this off here:
https://www.airbnb.com/help/article/1510/how-do-i-turn-instant-book-on-or-off
There are some perks to being an IB host- your listing appears higher in the results, you can see guests' star ratings, and require a validated government ID on the guests' account.
As for whether you can host only women, that's been a topic of some controversy! Federal laws make exception to Fair Housing Act when the owner is sharing space with a renter - known as "Mrs Murphy" exceptions. Airbnb allows it when you're sharing living spaces as defined in the link below. You need to make this a requirement in your house rules - Airbnb will allow you to cancel penalty-free if someone books against your house rules.
https://www.airbnb.com/help/article/1807/can-i-choose-to-only-host-people-of-my-own-gender
There are a lot of things to learn in hosting - reading through the articles on this forum, Airhostsforum.com, and Airbnb's help articles is invaluable to avoid pitfalls
https://www.airbnb.com/help