Included is a pic that shows the appearance of the first piece after you have folded the paper and trimmed all edges. Remember, this piece is right side up!
When you are ready to add the second piece of fabric, hold the paper, print side up, to a light source. Align the fabric edge, allowing for seams. Sometimes I allow a litte extra, just in case. Until you get used to the process, it is easy to cut tthe piece too small, and end up short...
I took note of the slant of the seam, and cut the end of the fabric strip to align with piece #1. (Not everyone does, but I find it easier for me.) Place fabrics right sides together, and sew the seam with a small (12 - 18) stitch. After sewing the seam, check with your light source that the fabric covers the neaded area. Then trim the seam to 1/4". You can also trim the fabric to block size, the edge of the triangle, because this is the edge of the block.
After trimming all sides
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Second strip addition
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