remember to cut the selvages off
did you wash your fabric first?
you can mark on the back of the fabric with ordinary pencil if you mark lightly on the cutting lines - the chalk pencils brush off better, though
marking heavily with a lead pencil on the quilting lines was not one of my better ideas - the marks didn't come out very easily
also, if you are cutting borders - a lot of "overall" prints have a very subtle stripe in the design - hold the fabric away from you and stare at it for a while - you might see it (or not)
sometimes it matters on how it frames the finished piece