Congratulations on finding that markdown deal. Making sushi rice at home is a great skill that will save you a lot of money in the long run.
To season your rice properly, you will want to make a seasoned vinegar mixture known as sushizu. Pure rice vinegar alone will be too harsh and sharp, which is why sushi rice always includes sugar and salt to balance the acidity.
For 1 cup of warm, freshly cooked short grain rice, the exact ratio is:
1 tablespoon rice vinegar
1/2 tablespoon sugar
1/4 teaspoon fine salt
To prepare it, combine the vinegar, sugar, and salt in a small bowl and stir until the grains of sugar and salt are completely dissolved. You can gently warm the mixture in the microwave for 10 to 15 seconds to help it dissolve faster, but do not let it boil.
Once your rice is cooked, transfer it into a wide, non-metallic bowl while it is still hot. Gently pour the seasoned vinegar evenly over the rice. Use a rice paddle or silicone spatula to fold the rice with a cutting and lifting motion rather than smashing it, so the grains remain intact. As you fold in the vinegar, gently fan the rice with a handheld fan or piece of cardboard to cool it down to body temperature. This creates that signature glossy shine and prevents the rice from becoming overly soggy.
If you are scaling up your batch, you can simply multiply these exact measurements by the number of cups of cooked rice you have.