Look on the following web site. I believe this is bacterial spot. Symptoms: Bacterial speck is widely distributed. Symptoms may appear on any plant part. Leaves of infected plants are covered by small, dark brown, irregular patches of necrotic tissue that are surrounded by yellow halos. Disease severity is increased by leaf wetness from sprinkler irrigation, rain, or heavy dews. Control: Minimize wetting of the leaves by using drip or furrow irrigation. Copper sprays provide effective control. Joe Here is a link that might be useful: Texas Tomato disease site

bggarric- Welcome to tomato growing! Your orange one will be ripening soon! You said you trimmed plant - some fruit can get sunscald if removed leaves reveal them to too much sunlight. You could create some light shade for it until it grows new leaves to cover fruit. Perhaps, a lightweight curtain (fabric shower curtains work great), rope, clothespins, etc. Don't touch the plant itself though. Might look a bit funky, but in your climate should grow quickly. You asked what to do budget friendly - just keep watering, lightly fertilizing, and watch for insects that might be crawling & chewing. I prefer to tie stems even in cages like yours to keep plant supported and spread a bit to fill the cage. Also helps as it grows taller than cage and flops over to keep growing. If tied doesn't crack stems. Use what you have to make strips of soft material (old tshirts, nylon pantyhose). ~~Enjoy your 1st season of tomato growing~~

The pictures are really too small to see enough detail. It's possible you could have several issues at one time occurring.

I learned that containers need to be well draining and need to be watered at least until water is running out of the drainage holes . I personally water till it runs out the drain holes then go to the next plant, after all have been watered.I go back and top them off again. If I add liquid fertilizer it is after watering. Also try not to get wet soil spray on the bottom leaves, and lastly mulching really slows down on evaporation.