Vegetable gardens should be watered in the morning before the hottest part of the day in order for the water to avoid evaporating before it soaks into the soil. Note that healthy soil is known to be approximately 24% water. Your garden soil should not have too much or too little water. The best soil also has both large and small pore spaces. If your soil has a lot of pore space like sandy soils, water quickly drains through it and cannot be utilized by plants. On the other hand, if you have dense, tightly packed clay or silt soil, your soil may be clogged with water as there is little pore space in these kinds of soil. This kind of soil may even suffocate the roots of your plants and prevent helpful soil organisms to aid the growth of your plant. It is ideal to water deeply (around 2 inches) and less frequently (once a week is perfect) so the roots of your plants can grow nice and deep. For seeds and seedlings that are for transplanting, you can water them daily or according to your hardiness zone and according to the watering needs of every plant.
That is if you plan to have multiple plants at once. If you want to grow several plants at once, you should try practicing the square-foot gardening method. Basically, this method is a simple trick of creating orderly, small, yet highly productive kitchen gardens. This technique was pioneered by the retired engineer and backyard gardener, Mel Bartholomew. Accordingly, the concept of square foot gardening is to create a small garden bed and divide it into a grid of 1-foot squares. You can then plant seeds and seedlings of your preference according to density based on plant size (example: plant only one tomato seedling per square, compared to around 10 radish seeds per square). If you are focused on rearing a vegetable garden, this method should be excellent for limited spaces.