Most of that stuff is very matchup specific, and is found in the matchup threads. UltraDavid wrote a very excellent guide at one point detailing Sim’s AA options against all of the character’s various options. Extremely useful, but unfortunately I no longer have it bookmarked. Should be easy enough to find, though.
The information you are looking for in that post sounds logical enough, but it all basically comes down to learning spacing. Fireballs are good, and if you have one on screen, you have the advantage. However, if you throw out a fireball randomly, you are going to be punished hard and die. There is already one thread for his U1 and U2, both of them stickied, I believe.
Yoga Tower is great for winning fireball wars. If you tower over a fireball and immediately launch one of yours, you can punish the opponent’s next fireball attempt with S.Fp. I believe again there is a huge list of what it does and does not avoid as well as it’s uses.
Combos -> B.Mk xx lp.flame (xx super)
B.Hp xx ex.flame or mp.flame xx super
Db.Hp, d.lk xx super
Slides are great for regaining proper spacing or avoiding unfortunate spots. There is a certain area in which your opponent has an extraordinary amount of options, and d.lk xx hp fire or d.lk xx lp flame (note that neither option will combo even on hit and will get you killed by anyone utilizing reversals) can regain a certain amount of momentum. d.mk is great for repositioning quickly if they do something stupid. If they try to jump in after they have you cornered, it is generally the best option to get out of the corner. D.hk is one of Sim’s options for using tripgaurd to AA. Useful in the boxer matchup in particular, however can be empty jumped and will cause you a lot of pain. Generally better to use d.hp unless you are certain.
Don’t teleport unless you have a damn good reason to. IAT shenanigans generally (and by that I mean almost always) aren’t worth it. The jump cancel teleport is worth using (not sure what the proper term for it is, but when you IAT so low that you can’t do anything, but you recover much quicker than doing a grounded teleport).
Blocking is good, pressing buttons is bad.
Aaaand, that’s about it. The rest of the information is around and separated quite logically. Some of the stuff I’m saying is probably wrong, but I don’t care too much. Just focus on learning good spacing, the rest of the gimmicks are really just… well, gimmicks.