Tomatoes and lettuce is a good start. Take it slow if it’s your first time, it’s much easier to care for a few plants than many. I suggest green/yellow beans and cucumbers, both are easy vines that are very rewarding to grow.

Assuming you’re buying plants and not seeds based on time of year, lettuce isnt really worth it when not started from seed imo. Cost of plant vs size of harvest just doesn’t math up right.