Newbie with a Ninja Luxe Cafe

Hi!!! I’m new and am searching for a good sweeter espresso bean that will make a great latte. Suggestions would be so appreciated. I bought just regular coffee beans and they just didn’t cut it. The owner of the local franchise store suggested getting espresso beans not coffee. Could anyone help educate me as well. To my limited understanding it’s just the roast or am I incorrect?

Budget is under $30 preferably and on Amazon is alway a plus!!!