Hi fellow gardeners. Sorry for the forthcoming novel.
Ken, congrats on getting started. The first year, you may as well just expect a lot of failure, even if you did lots of research ahead of time. Even your neighbors might have different conditions than you, and you can only figure things out by getting started and experimenting. Keep doing what worked, and only repeat a failure if you think you know what went wrong and you have a solution. Otherwise, it might not be worth the aggravation.
It sounds like you might need a fertilizer made for flowering plants. You know those NPK numbers on fertilizers? The ones high in nitrogen are good for leafy greens like lettuce, cabbage and spinach. The flowering veggies - tomatoes, zucchini, squash, cucumber, etc - probably want something higher in potassium. My first year or two, I used Miracle Grow all-purpose, which was 24-8-16. That's all that was available at my hardware store. I got good results, but I got better results the following year when they expanded their garden department and I got some 15-30-15 for the flowering veggies.
This year, my garden was the worst it's been out of the four years I've had it, but it was to be expected. The weather was just awful in spring until it was just too late, I admittedly neglected it since I was more stressed out over the wedding, plus the arthritis in my spine was bugging me and I couldn't have been arsed to weed. I'll have more enthusiasm next year. I'm already looking forward to it.
...And yet, I still had some success. There's a pumpkin ripening, and I've had a lot of cherry tomatoes. My late tomatoes, Brandywine and Burpee Supersteak, also did fairly well. The zucchini died, though, and the cucumber only produced two cucumbers before the powdery mildew killed it. The peppers didn't do too well - again, the hot weather came so damn late. I also had a slug problem that I procrastinated on taking care of.
If you have a glut of ripe tomatoes, the easiest thing to do, IMO, is just coarsely chop them, simmer them until soft, and puree. Throw it in the freezer. It's great for soup or chili. I couldn't be bothered removing skins or seeds. I don't have the capacity to get into canning, and this works just fine for me.
Recommended forum for gardeners and wannabes:
https://www.helpfulgardener.com//forum/ It has a good section for veggie gardening. And you can creep my photos.