Adding a WooCommerce carousel is now made easy with the Woo Product Carousel Element. To start, add the element to your desired column.
Now you have the options window open. Here you configure the product carousel, by selecting options. The Picture Size is the first option, and the best choice here will depend on both your design wishes and the sizes of your product images. Try both to see what the differences are. The other main options are to choose the category, or categories, you wish to display in the carousel, and the number of products you want to display.
There are also a range of other minor options, to do with layout and spacing etc. Go through each on of these to make your choices.