I have very limited skills with tools. My wife's father and brother are both mechanics so anytime I use power tools, my obvious lack of skill/experience makes my wife nervous. I built this screen about 2 years ago and decided on this design because it looked easy and I had the tools. I would provide you with the links I used but I no longer have them. The screen is used about 10 times a year but originally built for our annual Halloween party. I made it in a 2.35 aspect ratio but in retrospect, much of the material we watch is 16:9 so I would make it differently next time. I only cut straight lines on the 1X4s and the plywood was diagonal cuts to make straight triangles. I made sure the triangles were perfect as I used them to make sure the corners on the frame were correct.
For your purpose, unless you are positive on the aspect ratio and size, I would go with the largest 16:9 you could build and then zoom in and out until you find the size that is comfortable for the seating distance. The bonus is that you can use the screen in the backyard when you are done using it to test for size in the dedicated theater.
1X4s - make sure they are straight
A small square piece of plywood to cut into triangles for the corners
Hooks to hang it - I have concrete block walls in the backyard so I use hooks to hang a ladder on a wall
A box of screws
A lot of staples
Staple Gun - mine was an inexpensive electric one
I am attaching some pictures below. Hope this works as I haven't done it before...