Welcome to the world of meditation. You don't need to sit cross-legged on a mountaintop, and you don't need to empty your mind (that's nearly impossible).
Beginner's meditation requires only one thing: notice your breath.
Find a comfortable seated position. It doesn't need to be perfectly straight, no lotus position required — just comfortable. Sit on a chair, a cushion, or even lie in bed.
Close your eyes. Breathe in deeply, feel the air enter through your nose, flow through your throat, fill your chest, reach your belly. Then slowly exhale, feeling the air's path as it leaves your body.
Don't control the rhythm of your breath — just observe it. Like sitting by a river watching the water flow — you don't need to change the river, just watch it.
Your mind will wander — to work, to dinner, to yesterday's conversation. This is completely normal. When you notice your thoughts drifting, say to yourself "oh, I'm thinking," then gently bring your attention back to your breath.
Each time you bring attention back, it's a "meditation push-up." You're training your "attention muscle."
You might only focus for a few seconds at first — that's already great. Gradually, you'll find yourself able to focus for longer. This isn't a race, there's no finish line. Every moment of focus is a small victory.