This video will give advice and principals for sizing a vegetable garden, and provide key points to layout a vegetable garden. Make sure you keep tall plants to the North of shorter plants to allow for Photosynthesis. And ensure you keep plants properly spaced as well as accounting for walkways.
Engineering Graph Paper – really useful for any layout work from gardening to woodworking (affiliate link).
Vegetable Height and Spacing Guide
Cliff Notes on planning/layout of a vegetable garden
Vegetable to Canning Guide
Vegetable Plants Required per Person, or Square Foot Area Guide:
From Rutgers University
From Michigan State
Again, I would suggest that you use those Plants per person/square foot guides with caution if you are new. They are based on farm yields over time, and are averages. So, your garden will never produce exactly like these guide, but they do provide a decent estimate.