As already said, hard to give advice when we don't know what you are looking at.
However, that being said ...... start with graph paper and draw out your design.
Work with it in whatever scale you want. IOW actual size or 1/4"=1", 1/2"=1" etc.
Then you can come up with your measurements and how to create your block ..... all squares, HSTs, flying geese sections, etc.
Just remember to add 1/4" seam allowances to your calculations before you start cutting.