Potatoes and pumpkins won't grow if planted together, ironically! Pumpkins have the capacity to take over everything, I've seen the plant fill an entire 1/4 acre block backyard lol. I think you've probably missed the tomato season. Things like onion and garlic take a really long time to grow - I planted brown onions last year and they took 8 months, but they were a sensational flavour and they reseeded themselves this year. Lettuce is pretty simple but the snails do love it and caterpillars devoured my broccoli (leaves only, they left the vegie itself alone). Capsicum is another easy one to grow - mine was super-neglected and I still got small capsicums off it.

Last year was my first attempt at growing my own things. We have a tiny suburban block so I used the "dead" side of the house and planted in the retaining wall style garden bed. We got pumpkin, carrots, capsicums, broccoli, tomatoes, lettuce, spinach, beetroot and brown onions. I also have flat leaf parsley, rosemary and oregano growing. I had no previous experience, we just started out with a good soil recommended from the nursery and a couple of bags of chicken poo mixed in. I only watered on really hot days, but it all pretty much got left to it's own devices. I think we ended up with about 50 tomatoes! I looked at what seedlings were available and just planted what I knew we would eat.