Finalization of the site

1. Advise where and which domain is better to buy.
2. On the site there is an application form, you need to make sure that the data from the site falls on the work mail. And also that after sending the application, each client receives an automatic response by mail.
On the site itself:
3. Change your phone number.
4. Change the text on the button, when clicking make a transition to another page.