The first thing you should do is of course register for Youtube account and follow the easy instruction provided. After that you can sign up for Google Adsense to earn extra income. Through Adsense, Youtube will pay your share from the revenues.
To do that, you need to sign up first for the Youtube partnership, a revenue sharing program. Create your original videos and try not to copy others, pick your niche and decide what type of video you are going to upload (comedy, casual video logging, news, how-to, drama series, product reviews etc). Adding a watermark on your videos to direct users to your website is a great idea (of course you need to have a website). You are also allowed to insert link in the description box beside your videos to your site and you can put affiliate links and adsense on the site.
Once you have enough videos in your account, promote them by sending it to your friends, social networking sites and forums. You can leave video responses to other videos that match your interests. Find the latest videos posted by the most popular youtubers, make responses that are interesting or funny. If the youtuber likes it, he might favorite it and even mention you in one of his videos then it is a good news for you. Favourites help because they post to the youtubers channel, it’s just like free advertisement. Respond to any emails or messages you receive on Youtube to build a relationship with your viewers. Make more videos and upload them to Youtube, the more subscribers and views you get the better. Make sure the video file format is acceptable for Youtube.