Hello! I'm interested in starting a vegetable garden in my backyard, however, I'm new to this, and I have no idea where to start. I live in Texas and the climate is hot. My backyard is full of grassy weed-ish stuff. I plan on growing tomatos, cucumbers, cantaloupes, squash, peppers, and onions. I'd be interested in any tips or advice you guys have. Thanks.

Before you start your planned gardening, make sure that you would have ample supply of water to sustain the vegetables that you chose to plant.

Looks like you have sandy soil and it will need lots of compost. The best thing you can do for your plants, veggies or ornamental, is to add lots of organic matter to the soil. The best way to do that is with compost. A 3" or 4" layer on top of the soil and then mixed in will make your plants happy. You can purchase it by the bag or in bulk if you need alot. It's usually less expensive in bulk. You can also make your own, but that takes time. It would be best to start your compost pile from the weeds and turf you will remove to start your garden. If you decide not to plant now, you can start by preparing the site. Remove weeds and grass (you can rent a sod cutter), add compost and mix in. Then plant a cover crop for the winter. In spring, about 3 weeks before you intend to plant, you can turn in the cover crop and let it decompose. Then you can plant.

I'm sure you will be reading for a while, but don't hesitate to ask more questions. You've got a nice big yard and planting some flowers around the outer perimeter to help control insect pests would be a great idea. It's covered in the above link about organic gardening.