Hi @Annapurna-Beach-House0
Your listing looks good to me and I can see that your business is up and running already!
I hope I understand your first question correctly. You should be able to use the following link to send to guests:
Annapurna Beach House - Houses for Rent in Nandgaon, Maharashtra, India - Airbnb
I wouldn't worry about ".in or .uk" or whatever - it will open on the guest's local Airbnb site correctly. For example, when I click the link it shows ".co.za" in the browser, and it correctly displays your listing.
If you want to, you can also create a custom link (that looks a bit more user-friendly) that you can send to your guests. Go to the Listings tab and click the listing. Custom link is the last option when you scroll to the bottom.
Regarding your second question, @Joan2709 has created a guide for new hosts that should be very helpful.
A Guide For New Hosts - Airbnb Community
Once you've had a chance to look at the guide, let us know if you have any follow-up questions!