You are on the right track, be sure they are strong enough to support hanging pots, as soon it will be full of plants and that means “hang them up”.
When I started in greenhouses they were redwood and glass panes, a pain, as you used white wash on the glass in the summer and then removed it.
Later came a Saran cloth screen, that we bought, by how much of the light we needed.
On the mountain, I did the roof in that corrugated fiberglass from the lumber yard. The walls were used windows that i got a good buy on.
Here we used the corrugated fiberglass to build them with and regular lumber for supports.
When the wind pattern changed for my place, it took the roof off the greenhouse and I can no longer garden, so did not replace it.
I think that over the years, I tried as many things as I could think of to get a mulch on this ground and in it , about all my ideas got me was scorpions under them and other bugs hiding.