Need help creating an image carousel.

Hi!

I have trouble creating a good looking image carousel. I mainly have two issues.

1. How do I make it autosize the pictures without me having to manually resize every image? When I did it on my other page with weebly, all I had to do was add the images and everything automatically got nicely sized in a carousel, like this http://vitasino.com/baiyun-world-leather-trading-center.html

But when I try to add a image carousel with the fronted editor, I get all kinds of problems. Medium is too small, large/full is too large.

2. How do I align it? I want it to be centered, but I cant find any option for aligning.

Help please