Will metadata play a big factor so my video shows on the top results when searched by keywords?

Metadata is part of the search algorithm, mostly from the title you choose and the keywords you place.

Your video title must be related to the content. It is best to make it short but accurate with correct spelling and grammar. Keywords, on the other hand, are words or key phrases that best describe the video content. Make your keywords relevant; never use misleading keywords in the hope that it will increase visibility for your video.