Looks like you picked a good fabric and will get color contrast, blender pieces. I did one and I hate to say it but I bought the 60 degree ruler which keeps the points, and it was a big help.
When I did mie I stuck to the rules about which way the triangles have to go - I did it by the book - but I have heard from many QB members that it is fine to turn the pieces any way you like to get the best arrangement.
Arranging is sooooo much fun!