Beginning SSF4 AE 12, I Need Help

i want to take this game more serious.
i played the the street fighter series causally with a few friends but never took the series serious enough to learn the mechanics, i know the basics of the game but i want to go more in-depth.

I wondering what characters i should learn.

I want Help in
- Pressure
- option Select
- Kara Throws
- Frame Links
- Better Planking Methods
-Safe Block String
- Knock Down Mixups

Any Help is Appreciated

Hint: Been Playing for a week now and finished RYU, Makoto , Akuma , Guy and Cody Trials.