That’s actually in pretty good condition, result ! You’ll be amazed once you get going how. You can get that up and running. Have a think about how you want to lay it out. I’ve found it really helps to have a bed and path system. My beds are just heaped up soil mostly. In one place I flipped the turf then dumped a load of manure and topsoil (Gumtree handy for this in the spring) on top. Squash loved it and grew very enthusiastically last year.
Somewhere to compost handy , Gumtree again good for this or pallets lashed together with cable ties. Not entirely sure what those wire things are? Also what is the situation re water?
Are those tall things sweetcorn? If so I’d start on that section as don’t think it will take a lot to get them out and gently dig over a bit to make it look good quickly for a bit. Think about if you want soft fruits and if so get some of them in the spring.
We’re not allowed to cover our plots but if you are there’s a lot to be said for covering a section with membrane or cardboard and growing squash through it which will make it look cultivated this year then when uncover next year it should be easier to deal with.
Only plant courgettes if you can get there regularly and don’t mind marrows, never more than 2 plants whatever you do or you will turn into the courgette fairy with your neighbors.
Very important. You will need somewhere to sit so you can admire your work this is a vital bit of allotmenteering and must be taking seriously. Don’t over do it at the beginning, let your body get used to it gradually, one bit at a time. Only grow what you actually like . Enjoy!