I’m trying to practice in the training room to learn moves and combos. I’m still new to it so would you guys recommend fighters to learn? I REALLY love Evil Ryu but I have a hard time getting combos to link together. At times it gets frustrating and I get nervous. I want to be comfortable when I play ranked and keep a focus mind. I really would love to keep playing evil ryu. Are there exercises to improve reflexes and muscle coordination? Sorry if I’m asking so many questions. 
Play whoever you want, if you like E. Ryu, then keep playing him 
you just need to keep practicing his links and you’ll eventually get the hang of it and it’ll be second nature to you. Just keep playing, don’t give up! Also with the nervous thing, is this when you’re playing ranked?
No just when trying to link combos or FADC. I get frustrated and start mashing buttons and jerking the joystick.
There is no easy way out, if you are looking for one, dude, you just need to learn how to stay calm and focused during the fight. As for combo practice, well, it’s just muscle memory, practice a lot and you’ll notice that you do combos without even thinking about them.
I’ll just have to practice practice practice and not get frustrated. If I do I just need to take a 5 min break and go back at it. When should I give the ranked a shot? All I’ve played is trials and challenge
You can give Ranked a shot whenever you want, however, I strongly recommend playing as much Endless as you can. It’s a better learning experience.
In a Ranked match, you will fight someone once and probably won’t learn much about “how to play”, no matter if you win or lose.
In Endless, you have the chance to fight someone multiple times in a row. This is good because you can learn to adapt your play style to what your opponent is doing. It’s especially useful for beginners if your opponent picks the same character over and over. You will naturally get used to seeing certain moves, combos, set ups, etc. and eventually you will learn how to defend/beat them.
And yes, practice, practice, practice. It’s good to practice in training mode, but I also like to practice in Arcade mode (and I don’t think it’s something a lot of people take advantage of). It’s a good way to practice spacing, punishing blocked/whiffed moves, and “real match” situations.
learn to plink if you have difficulties with e. ryu’s links. try to find a visual way to confirm when to plink the inputs.