Geeetech

Hi, I'm new to 3D printing and kind of struggling with it, as the first layer won't stick to the bed. I'm trying different settings (see below), but I think the problem it that the bed is "wavy" on the Y axis: when I move the bed from front to back, the distance between the bed and the nozzle varies...

I can get this for a good deal right now, sub $300. I don't need to print this large very often, but overall what are the thoughts on this vs what else? Does it actually have an all metal hotend, is it going to be a pain or is it pretty straightforward? I currently have an a10, but I got it used and...