here the full steps about building instructions for a stage
building a stage platform
Then, it is time to create the floor of the stage with the 4 feet by 8 feet plywood sheet , next steps lay it over the wooden pallets, take 6 feet high and 2×2 wood pieces to form four vertical posts of the stage, fix these pieces at all the four corners of the stage.
stage
Thirdly, connect all the above created vertical posts to the shorter ends of stages with 4 feet long 2×2 wood pieces. Make the back curtain of the stage, and take the 8 feet 2×2 wood piece and fix it by screwing it between the back posts.
After the back curtain has been prepared, get three shower curtains and fasten or pin them around the sides and back portion of the stage. The remaining shower curtain is for the front portion. Next, raise the platform by using cinder blocks. Your stage is ready to be used. There is the full steps about building instructions for a stage, may help you.