1) YouTube account: If you already have a google/gmail account, you can log into YouTube right away without any fuzz, if you don't then setting up one should be pretty straight forward. Just visit www.youtube.com and follow the instruction.
2) Adsense account: Next visit ww.adsense.com and use the same google/gmail account that you just created to log in. Here you need to link your YouTube account with Adsense account. Please take note that YouTube pays its video publisher through AdSense.
3) Video Upload: Its done, go back to YouTube and start uploading your videos. Also make sure no one is playing online game when you upload as you don't want them screaming at you.
4) YouTube Analytics: Once you are done uploading, YouTube Analytics have a lot of good info about your videos and your viewer.