Youtube is a second biggest search engine in the world (only behind Google). Below are some of my tips to do marketing on Youtube:
“Call to action” annotation can direct your customer to your website, or ask them to call to your shop or phone you. You can encourage video sharing. You might be able to go viral over a night. Additionally, when you use the “call to action”, you will be able to track the results.
Youtube is an interactive platform, it gives you direct feedback from the customer. Try to monitor comments and ratings, and respond to them if necessary.
Improve your weighting in the Google search engine by including your video on your web or tagging them with the keyword that you think people will likely search for.