If this is your first year gardening, take it slow. Plant a few tomatoes and peppers. A small herb garden. Maybe some onions. Get used to how certain plants grow and their needs.
Do you love fresh tomatoes and tomato sauce? Is salsa your thing? Then tomatoes should definitely be on your to-grow list.
Knowing your zone is one of the most important parts of gardening. It will determine what you can plant and when.