If you're sitting the projector on a coffee table or book shelf you won't need a ceiling mount, if you're mounting it to the ceiling you will.
You'll need a HDMI cable which is better than wireless for many reasons.
You can project directly on a light coloured wall but a projection screen looks better and because most have some "gain" they make the image brighter too. The best is fixed because there are no ripples. Pull down is like a blind, OK but when the wind blows it will move.
Feel free to contact us for items not listed here such as specialist mounts, custom size screens and ex-demo screen specials.