As you say you have never leased before, worth noting that leasing is not necessarily the best option for all
I would ask, what is the thought process that brings you to leasing?
For example, if you want a fixed term and NO risk, it would work , but if you want ANY flexibility ( if circumstance,usage,finances) change, then it’s not a good option
Also, depends on the vehicle and the WLC (whole life cost)
eg VW eUp ( because its a simple example) .you can buy one for £21-£22000 but you can lease one for about £6500 (WLC) for 3 years.
Would buying it, with a view to it being worth more than £15k at 3 years be better?
A KIA Soul Maxx will have a WLC over 3 years of £14500 ish over 3 years against a new price of £32500……now a 3 year old SoulMaxx with 18000 miles on will definately be worth more than £18000
Important to do the maths for your individual car choice and personal circumstance
Remember, the biggest advantage of leasing is the business recovery of VAT on payments and 100% claim against tax as a business expense…..and neither of these apply to you or any private individual
( and all of the above does not factor in the return condition process of each individual lessor)