I bought a pack of oatmeal and it didn't have any instructions on how to cook it and I have no clue what I am doing and I don't want to disappoint mom.
If it is instant oatmeal, just add boiling water (ratio water to oats 2/1) and let it sit for 5 minutes. If it not instant, same ratio of water to oats, boil for 5 minutes while stirring, remove from heat, cover and let sit for 5 minutes. I googled "how to cook oatmeal" and found several similiar ways.
Common "rolled" oats are flattened into fat disc-shaped units; "quick" oats are rolled and then further sliced thin to cook faster. "Steel cut" oats are just cut into small hard pieces like short rice grains.
For quick oats, add about 2:1 water to oats, and cook until done to desired softness, which should be a few minutes. For rolled oats, cook longer and maybe add a little more water to account to evaporation. For steel cut oats, go up to 3:1 or even 4:1 on the water, and cook for 30 minutes or more (or let soak overnight and cook for 10 minutes). They'll need some salt, but not much.