To become famous you need to do this:

Make a youtube accout
Make a twitter/facebook accout
Join Planet minecraft
Get to a very high rank
do mods
do videos
do minigames
play with other youtubers
film with other youtubers!

its worth it! im currently on play with other youtubers :D
With the twitter account you can update when you are not filming and other stuff like recommending stuff :D