The Modern Drone has been developing over a number of years, with the market (I suspect) numerically overwhelmed by pilots still on their 'First' drone.
The wealth of excellent YouTube content on this subject is extraordinary. I was in your situation a year ago, and purchased the P4Pro+, as I favoured the larger sensor, and the integrated display. [My mobile Phone was an OLD Nexus 5, with a low-end plan, not ideal for the task.]
The advantage of the built in screen is to be weighed up against any potential 'screens' in the household. The convenience is high, but so is the (likely) built-in obsolescence, when the 'next drone' comes knocking.
I would regard the advice of the "most lucid of teachers", would largely overwhelm 'most' new users, and suspect that you will learn much on a 'local field' before calling in experts to fine tune your flying. judgement and knowledge. Think about learning to drive a car at your current age, rather than when you were 17.
My suggestion?
a. Research and purchase the Drone.
b. Take it out, fly a bit within your comfort zone...
c. Research more video guides..
[Repeat b,c.]
Let your confidence build progressively, then seek answers to fill in the gaps in your knowledge, which should increase with every flight.
This site is amongst the best of the resource base for 'specific, detailed knowledge and advice', but a large core of good content is available to review at your own pace, on [YouTube] as a first call.
My opinion just reflects my experience with a drone, Others will also contribute, valid responses from their experiences; then it is over to you!
Good Luck!