I find the easiest thing to "practice" writing with is to take one character, give him a clearly defined desire, and then put one character opposite them with a clearly defined opposing desire.
"Life just isn't what it used to be."
The armoured man sat on the dirt beside the Gromp, staring down the path. He rested his head in his hands, a sullen look on his face.
"It used to be life was simple," the man continued. "It used to be I knew my purpose. My goal. But lately, well... It's become harder to see."
The Gromp nodded. It stared at the man curiously, wondering what this man, this champion was saying. It knew the words, but it made no sense, like the wolves further down.
"Maybe you want a hug." The boy bundled in bandages said. He sat beside the man, and opened his arms for a hug.
The man did not hug.
"Haven't you ever felt like that?" he asked. "Like some great purpose has eluded you? As if nothing even makes sense." As if black were white, up were down and Ionia had an effective government.
The boy shrugged. "I just want friends," he replied. "But for some reason, no one wants to be my friend. They say I'm too depressing."
"You want friends," the man repeated. "But do you fight for your friends? What do you fight for?"
"Because... I have to?" The boy gazed up. "I don't know... Everyone just tries to kill me. Except you. You're nice." He smiled beneath his bandages. "Won't you be my friend?"
But the man had risen, a glint in his eyes. "I see... I see now! That's precisely it!"
The boy looked at him, not comprehending.
"Don't you see, Amumu? I have made things too complicated! It doesn't matter that I've been taught new things. It doesn't matter that what once was good and true no longer is the best to do. I still have my purpose. My ultimate goal." The man lifted his heavy sword, and smirked. Everything made sense again.
"Please don't!" The boy shrank back as the man rose to his full height. Moments ago, he had managed to convince the man to lay down arms. Moments ago, he thought he'd found a kindred spirit. A friend.
He knew he had not.
"DEMACIA!"
So you have Amumu, whose desire is to make friends. And then you have Garen, who just wants to kill his enemies. You introduce a conflict (Garen wants to kill, but Amumu wants friends), and then resolve it. Then you just write and stop caring about making sense. Practice isn't about making sense. It's about getting those words onto paper and figuring out what works for you best.