Hello, and welcome! If you want egg's but you don't want a roo or to hatch out egg's, it would be best to pick out the breed's that do not normally go broody.
Hi Barb and welcome to BYC. I wish you all the best with your chicken project.
On this link you'll find lots of information on almost every aspect of keeping birds - from coop building ideas, to incubating eggs - https://www.backyardchickens.com/articles/
Oh yes, your chickens will love to help in your garden. You can always plant cherry tomatoes, just the right size for Chickens to eat. Have fun deciding on your flock. WELCOME!