Make your life easy, and ask your tenants to apply online, rather than by email or through a paper form. To create an online application form use Google Forms, or TypeForm here are some example questions you can use?

Who will be on the tenancy?
Please provide Full Name, Phone Number & Email for each applicant.

What is your occupation?
If student please provide year of study.

Are you able to pay rent up front, if so how many months?

Are you able to provide a UK based guarantor?
Yes
No
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The rent is advertised at £XXX per month, but you are able to offer above the asking rent. If so what is your best and final offer?

What is your preferred move in date?