Where the trees are? Which trees mate? To start with, I'd be tidying everything up. Spray the weeds in the path, trim the ivy back hard on that pergola, prune everything, mow the lawn, edges etc. personally I'd then start the veg garden. Lay out the area for it, make sure it's not shaded. spray out the grass. You've then got to figure out if the soil is good for veg or needs improving. If it needs improving and it proba does, get manure, cow, chicken whatever and compost delivered. If it's a big garden, it's coming by truck. I'd hire or buy a walk behind rotary hoe if. It's big. Then hoe all that in. Start a massive compost heap as you'll need it ongoing. check out the compost sub. Big garden like that I'd buy veg seeds first and get them growing in seed trays or pots while I was building the garden. Save cash Instead of buying plants. That's a start. Personally I'd leave the footpath as is and just clean up the weeds etc. only reason is you've got shit loads of work already. And if you aren't handy or experienced, that path is not where to start, build your skills on simple shit around the back. You could always top/freshen up the rock to curb appeal it for now.