
There is no right or wrong way to make sushi rice. By this I mean that each family uses their preferred ratios of rice vinegar, sugar and salt. In my family we like it slightly sweet and therefore use a bit moe sugar and less salt. Play around and find what works for you and your family.
Now to start your going to have to make your rice. Use short-grain rice. Short-grain rice sticks together and that is what you want for making sushi. I use three cups uncooked and rinsed rice to three cups of water. This makes enough for about six norimaki rolls. Wash the rice until the water becomes clear. I usually wash and drain the water about six times. If using a rice cooker then follow your rice cooker instructions for 3 cups of rice. If using the stove, then in a large pot, bring the water and rice to a boil, then cover with a lid and turn to simmer for about 15 minutes. Remove pot from the stove and let sit for about 10-15 minutes.
Then make the sushi-su (sushi rice seasoning liquid) while the rice is cooking. After the rice is cooked move to a large bowl, and while the rice is hot sprinkle the sushi-su over the rice and gently mix. The sushi rice is now ready to use.

If you don't want to make your own sushi-su you can use ready made bottled sushi-su or powdered sushi-su. I do use it sometimes. But when I use the bottled type, I like to add a little more sugar to it. Just read the ingredients to make sure it is gluten-free.

Here is a link to my blog on making Onigirazu. It is a popular as a snack or for lunch. It is a rice sandwich made with sushi rice and a variety of ingredients you would put in a sandwich.
Note: These are my personal experiences and opinions. Always seek out a medical opinion for medical concerns.