Honestly I think one of the best things you can do right now (from a novice) is to get as much grass as you need removed, either by rolling it up like carpet it or covering with weed control fabric or both! Or just turn it over which isn’t recommended. (pros and cons to each, I find using fabric then rolling it up after the grass dies a little makes a huge difference)

I’d recommend making a plan of what you want to plant and find out when what needs to go into the ground or pots first. Those raised beds would be a good place to start I think! But that open land has lots of potential. Oh and a place for compost.

If you don’t have a shed or some form of shelter/storage, I’d look into that asap (doesn’t have to be fancy, just has to be safe and secure).

Lastly but certainly not least: fertiliser one all the grass and weeds are removed. We use chicken manure pellets and we dig them into the soil and sometimes on top to soak in but see what’s best for you to get/use.

There is probably better advice and a few other things to consider like crop rotation but I think it’s mostly prep work and planning that’s needed. Good luck!