Which way the sun rises/sets…
Does it get sun in the morning, afternoon, all day, barely ever?
Deffo clear all ththe stuff out, the space will seem bigger and you may end up wanting to sit where rubble is because it gets more sun or something.
Then budget. Things can get expensive quick… so prioritise things. Plus loads of lovely gardeners like sharing plants and old pots and stuff.
Are you quite a handy person/good with tools? Know someone who is?