Welcome to gardening! My advice is to prepare the soil before you plant by adding an inch deep layer of compost and mixing it in well. This is a very important first step. Then plant your plants and water them in well. You should only have to water once a day for a couple of weeks and then as they get established you should be able to back off slowly to twice a week.
Don't get discouraged if everything doesn't do well the first try. Just keep learning and trying things. Visit local botanical gardens and home gardens that you admire for plant ideas. Some easy to grow plants include bulbine, yellow bells (Tecoma stans), Salvia 'Indigo Spires', and lantana. For vegetables squash and green beans are pretty easy. Check out the following web page for more vegetable gardening tips:
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