Help selecting new bicycle tires pleaase. I dont know much about bikes?

Thinner tires will lead to a rougher, bumpier, less comfortable ride. I'd suggest a 700x32, something like the Bontrager Lite Hard Case - I rode them for years on my CX bike on pavement and never had a flat. Experiment with tire pressure, too......just because a tire can take up to 110 psi doesnt mean you have to pump them all the way up for the best ride. I usually rode mine at 70-80 psi.