Homemade Greenhouse

Homemade Greenhouse

Hi there, I'm new to the comunity and new to gardening. I'm interested if there is any way of making a homemade greenhouse on an appartment balcony.... Um what I was thinking is having half of my balcony sectioned off and completely sealed with some heavy plastic, taping any holes there might be... Would I need some sort of moisture in there? Lights? I'm very interested in doing this so I can grow my own produce and spices. Thanks in advance :)
2 Questions:

2 Questions:

Heligan gardens, Cornwall

Heligan gardens, Cornwall

Done for the Spring, I think.

Done for the Spring, I think.

Good Afternoon Everyone

Good Afternoon Everyone

Plant ID

Plant ID

Need ID on a plant. Imagine that!

Need ID on a plant. Imagine that!