Hello,
1)
.product-view-booking .price .amount {
font-size: 16px;
}
.product-view-booking .product-title a {
font-size: 18px;
}
2) By default there is “Sale” Label is available but you can change the “Sale” text to “Hot”, go to Theme Options > WooCommerce (Shop) > Shop elements > Sale & Out of Stock.
Additional labels you can try to add using a 3rd party plugin.
3)
.single-product .sku_wrapper {
display: none;
}
Regards