I would create another block in EQ to the size of the large lt blue triangle and draw that first and print it out as a template. Then draw in the dk blue diamond with the black triangles and print that one out, either as a foundation pieced or simple templates. They will all have the seam allowances printed.
You would then start sewing the black/dk blue triangle sections first and add them to the lt blue ones. If I knew how wide and long the pieced border would be I could tell you sizes of the diamonds you would need to cut. And I agree with starching well before cutting your strips.