I recommend a laser projector since they tend to be brighter and you don't have to worry about the light source burning out. Outdoor movie nights have to compete with ambient light no matter how dark it is outside. You'll also probably be projecting into a suboptimal surface, so the extra brightness helps. Here's what I have, it's small and works great for our outdoor showings:
Hook that up to WiFi and a Bluetooth speaker and you're money.
For a screen I use possibly the cheapest projection screen I could find, then I hang it using two movable tripods which I think are normally used for backgrounds like at school picture day. Something like this:
https://www.adorama.com/fpbs10.html
Everything packs up into a medium sized bag, and can run on one of those big cooler sized battery banks when we're car camping.