You should absolutely not write a set that is approaching the difficulty of nationals. Even if you were in a region that actually had nationally relevant high school teams, you still should not write a tournament that is harder than a regular high school tournament because there are too many hard sets out there as is. I would not even recommend housewriting the set yourself - if you want to produce a set you really should collaborate with an experienced editor for your first time doing this, or else just use one of the many fine sets from NAQT, HSAPQ, or other independent sets that aren't going to be run in Florida otherwise.
Charlie Dees, North Kansas City HS '08; University of Missouri '12
"I won't say more because I know some of you parse everything I say." - Jeremy Gibbs
"At one TJ tournament the neg prize was the Hampshire College ultimate frisbee team (nude) calender featuring one Evan Silberman. In retrospect that could have been a disaster." - Harry White