Whenever you're doing S.E.O., you should use a keyword research tool for something like that. It's tricky. You need to come up with a title that both uses the keywords you want to target and something that stands out (so people want to click on it). You also have to keep in mind that whenever you're coming up with titles, only the first 60 characters or so is going to show up when someone does a search. If it's more than that, the person is going to see part of the title and...Finally, there are some things that Youtube does not like promoted on its site -- even if the product itself is legit.
Years ago, a lot of well-known marketers got their accounts shut down -- just because the videos they posted were related to IM and had such in the titles or whatever. Marketers will often create new channels in order to keep their promotional stuff separate from their personal channel they use on a regular basis. I don't know if there s a list of categories that Youtube tells you not to promote or what since I don't use YT for promotion.
Joey