The first step to start your driving journey is to register yourself on the official DVSA website. The link is here https://www.gov.uk/apply-first-provisional-driving-licence. Once you have registered and filled in the form, DVSA will send your provisional license to your mentioned address.
Registration process: Identity details Address details Security details National Insurance details Passport details Card details Confirmation and Submission
Things to be careful when applying: Put in the right information Check before submitting Fill in your own form (don't let others do it, you can always take help)
Most important thing is do not delay in getting a provisional license as you don't have to give any test to get one. Also keep this data confidential to avoid any issues in future. Start taking your first step today to start driving.