Hi, Keef, welcome!
One key to learning to stop is to learn gradually. Start skating slowly on flat ground, and stop from there. After you are comfortable doing that, skate faster, and on gradual hills, and stop there. While you are learning, if falling is a problem, wear good protective gear.
A key to a T stop is to be able to glide on one skate, with the other in the air, or to come as close to this as you can. Then, when you are doing this, touch the other foot on the ground behind you. But only touch it very lightly. When you touch, you'll probably tend to turn a little, to the right or left. You don't want to turn, so think of why you are turning, and adjust your setdown foot so you don't turn. After you are comfortable with this, set your back foot down with more pressure, but still keep much of your weight on your front foot. Continue this progression of more and more pressure on your back foot, and stopping at higher and higher speeds, and on steeper and steeper hills. Think about what is happening, and adjust your technique accordingly.
There's more if you google skating stops or similar.