Hello Edze,
1. To customize the displaying of the discount price, the solution will probably be to directly customize the "Listing_price" file of the "Product" view of your front-end template, via "Hikashop->System->Display->Views".
2. You'll just have to directly edit the language file via "Hikashop->System->Configuration->Languages" and change the line :
PER_UNIT=" each"
by :
PER_UNIT=" "
3. You'll just have to create a category and add every discounted products in it, and then list every products part of that category.