Earn their trust. Let them view your video before you post it and ask them for their feedback. If they're open to it and think that your video is appropriate, then thats step one! Good luck.
You probably won't be able to convince your parents to let you buy explicit music. You can have them listen to the music first and have them approve the songs they think are least objectionable.
show them a video of it on youtube and they will notice that there is not much violence or swearing in it as they would expect
Honestly, you can't convince them. Either they will let you or they won't.
if your parents wont let you get sponsored, well, id yell at em.
you say parents are going with
I have the same question!
you ask them
tell them you want rats
be a good kid
come out of the closet
make a deal with them and stick to it :)
say please