Filters in the online store

The number 1 is like I have on my website. The numbers 2 and 3 are roughly how you need to change. As you can see, 1 is a filter for the price. I have made the default from the lowest price to the highest and vice versa. I would like to add another item (on the principle of 2) and that by default the goods are displayed randomly in the list. Perhaps because of this, you need to make the goods displayed on the page in some quantity (for example, 10-20 pcs) and below was a button - show more, when you click on which will be loaded and shown more products from the list. (currently, products are displayed by a certain number - 15, 30, 60) and 3 items. You need to make such a filter so that you can choose "from price" and "quot; to price"?