Hello K-Swoosh,
The beauty of the Adobe programs is that they work together well. You could easily import a composition from After effects into Premiere Pro. After Effects has an effect called Typewriter Effect.
In Premiere you would have to create that effect.
Create your title, choose "title" from the menu>new title
type whatever you like and close the title window. Your title will appear to your left in the project window. Drag the title to the timeline and click on it. It will appear in the source window.
Go to effects (window to your left):
Effects>Video Effects>Transition>Linear Wipe
Grab the effect and drag and drop it to on your title in the source window
Press the small arrow to the left of "linear Wipe". The options to the effect applied will appear.
Press the small arrow to the left of "Wipe Angle" and change the degree to 270.
Press the small arrow to the left of "Transition completion". A slider will appear.
Try moving it to the far right and to the far left. Notice that the text gradually appears and disappears. Take it to the far right, so that all the text disappears. Now press the Toggle animation which is the clock shape to the left of "transition completion". Now you are starting to use Keyframes to animate. Move the playhead to the time you want the first letter to appear. Press the "Add/or remove keyframe button" and move one frame to the right with one press on the right arrow key. Move the "transition completion" slider so that the first letter appears completely. Move the playhead to the time you want the second letter to appear. Press the "Add/or remove keyframe button" and move one frame to the right with one press on the right arrow key.Move the "transition completion" slider until the second letter is seen completely. Repeat until all your text is animated this way.
Hope this is clear. Good luck!