@Karl856
When a prospective guest sends an inquiry you don't need to pre-approve nor decline, just replying in the messaging is sufficient.
If a 'request to book' is sent, some hosts ask the guest to withdraw the request, to avoid the host declining.
If your potential guest is asking questions which suggest film making, inform them that it is against Airbnb Terms of Service to book an Airbnb for any commercial enterprise. https://www.airbnb.co.us/terms#sec201910_14 - see 14.1, bullet pt 2
Other hosts have posted on this subject - use the search box top right, for previous threads, & perspectives.