I really don't think you are being completely realistic about this yet. I know you WANT to, but can you REALLY drive the 2-3 hours one way 2-3 days a week it would take to get to the closest gym with a worlds team? Are your parents truly willing to make that commitment or are you trying to talk them into it? Are you willing to give up EVERYTHING else in your life except school for this, because you won't have a social life outside the gym if you do this, you won't be doing any extra curriculars at school, you will be missing things like homecoming, prom, ect because you will be in the car 6 hours 3+ days a week. Is that a sacrifice you are willing to make because, even though you think you will be able to do it all, you won't. Given that drive and the amount of practice worlds teams require, you will be doing nothing but school and cheer. Also, can you handle getting home around midnight 2 school days a week? If practice is over at 9, you will be 11:00-12:00 getting home.
I also think you need to honestly and objectively evaluate your skills.
Do you have a solid standing tuck and 3-4 jumps to tuck? If not I don't know that a worlds team will take you.
Is your round off hand full a nice, open full that fully rotates every time or a fetal position full you are barely landing?
Do you have any specialty skills that would contribute?
You already said you don't have experience basing at level 5, but could you get to some clinics that could help?
If you don't have solid skills to make a worlds team, I really don't think the 2-3 hours one way is worth it. Is there a compromise gym closer where you could say, cheer level 4 and work on strengthening your level 5 skills?