Hello and welcome!!
Everyone has to start somewhere
That greenhouse will come in handy for tropicals during the fall and winter, so no worries about that- although I'll agree- not the best choice for VFTs and Sarrs.
My immediate concern though, is about the greenhouse. I will say you absolutely need to put weights at the feet of it and give it some sort of support at the back, like a cross-brace (owait, that's the plywood you have there, isn't it?). Cause uh...I've learned firsthand and heard other's horror stories about the disaster that will ensue if you don't.