Can you help me understand my electric bill and possible solar needs?

I pulled out an old electrical bill. It says my consumption was 439 for the month. If that is typical, how many solar panels would I likely need? How do I figure it out? I live in a very sunny place, Cdentral Florida, and we can face the panels south, which I assume is the best direction.

How much space do I need to put them on the ground rather than my roof?

What about solar film? I have seen it on the side of buildings on youtube. Is that less expensive than panels? Does the film make as much electricity as panels in the same square feet?