Runco Projector set up questions

[duckland23]

Hi

I just bought a runco used projector from the internet . I was wondering how hard is it to setup . I am going to mount it about 13 feet away , and was wondering what size screen can I use . I may go with a 82 in screen or a 72 in screen , not for sure what size I will use . I don't want it to big but big enough for viewing my movies . I may project the image right on the wall for now . But if I do that , I will need to paint a fake screen on the present wall .Im going to look around for a good screen to use . But I am more interested in what size will the picture look like at 13 feet . I just want to no that or anything you can help me with .