i need to have different pricing based on options

can I have different pricing based on product options? I need an option for three sizes, and the price needs to be different for each size. Will the essential package allow that?

Yes. You can use characteristics for that:
www.hikashop.com/en/support/documentatio...html#characteristics

Once you added them to your product, you can use the "manage variants" area to set a price for each variant of the product.