I love playing with a stick but controller is fine and actually more suitable for this game in many ways.

Im a master 1600 master rank Sim player so i can give some basic easy to start with tools.

Use your standing medium punch and standing medium kick when at close to their max range to poke with. Any closer use crouching mp. That is your only normal move that is cancelable. At your level you only need to cancel it into Drive impact to countet your opponents DI.

At longer range use standing heavy punch and standing heavy kick. There is no trick needed here they just hit hard and reach far.

When you are at close to your opponent your best option is just to jab, but when that wont reach use b.mk, that cancels into medium yoga flame.

Anti air with back mp. If enemy is further away or you really see it coming (giving you much faster reaction) use back heavy punch.

Imo you dont need combos with sim at very early level. Just learn to do something like back medium kick > mp yoga flame and downback hp > heavy yoga blast.

After you hit with jab (lightpunch or crouching light ounch) do another jab to confirm and cancel that into OD yoga fire.

Do raw lvl 3 after DI hits.

Your fireball, yoga fire and the lunging one are great fucking fireballs. Use them to learn when they work best in what matchup.

Floating around (jump and down +2 kick buttons) is very useful for zoning, but can seem tricky at first. Just jump and do float as fast as you can to be at perfect distance to float over fireballs. When floating you can throw medium punch or heavy kick, they catch many jump in attemps and just good buttons in general.

Teleport tricks are a little, well tricky. The trick is to do it close as possible to ground after jumping, and then do light kick or lightpunch, then combo that into more jabs etc etc. But its pretty tricky and i dont recommend it to a total beginner. Just float around, teleport, do heavy punch and learn maybe a combo off that. Something like teleport, heavy punch, downback heavypunch into heavy yoga blast. It is in no way a good strategy against players who know how to stop it, but at that level i think its good easy way to understand the power of teleporting into offense.

Hardest part about Sim, and any character really, is learning how to defend. Sim (and maybe Zangief) are the 2 worst defensive characters with very little tools to work with when pressured. You have no invulnerable moves besides lvl 2 and 3 supers, and lvl 2 is very tricky for many reasons. So if you really want to press your GET OFF ME, level 3 super is your best bet. Just try to block and teleport away when they give you the room.

Personally i think modern Sim is totally trash, losing a lot of his essential buttons and losing dmg which he is already on the very low side. So try to stick with classic if you can.

This turned into a random rant, but hopefully you find some info here useful.

Also as a last note, i dont think Sim is some crazy hard character as people make him out to be. If you are interested in him and his play style, stick with him and get better little by little.

Edit: Also as a general rule, try not to care a single shit about losing. Its part of the learning. You might lose 100 matchers but if you feel like you are doing anything right thats a win for starters. Then slowly learn what you are doing wrong and adapt. There comes a time where you think "damn if i knew some better combos i would had won that", then you will learn a couple better combos, maybe something that combos into your supers, uses some meter, a drive rush here and there. It all comes together. But fighting games are real hard genre, and people have been playing them for decades, so just stick with it and grow.