I had a question. Assume that I download the Sia wallet? Then, how much space (e.g. in GB) will it take or do I need for my computer to sychro?

Second, Could someone explain or can i find it somewhere, how to mine Sia coin in normal language. I'm not very good with IT language. Maybe someone could make a youtube video for me and others who like to mine?
I have windows 8. I really dont know what to download ?