Have fun!
Take a pic of your fabric before you cut it
Use a design wall.
I used coffee filters to separate my triangle/hexagon units - and used them as dividers until i was ready to start putting them on the wall.
After you get them cut, and decide on the design for them, put them on the wall for your layout - take pics. the camera will let you see things your eyes don't. rearrange and take more pics.