Remember too much water can make for sick plants- it puts them at risk for fungal infections or rot.
You should know your soil type and what it lacks- so sending off a soil sample to your local extension agent can be a great start.
Before you ever start a garden you need to have some basic knowledge of your growing zone, your last frost date, and the preferences of garden crops.
Your gardening zone is very important. It helps you understand your climate and what can and can’t grow during the different seasons in your zone.