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Who you use depends on what you are marketing and how much you are willing to pay for it.

Look up your local respected marketing company - they will have the know how to help you with a content marketing campaign. If you are looking for a more wallet friendly solution, look to virtual workplaces like oDesk.com to find freelancers with proven experience.

There are many marketing professionals who moonlight on such sites to make extra cash. There are also specialists in certain types of content marketing so look for one who specializes in the type of content you provide.

Transcriptions definitely have impact on your rankings in Youtube.

The purpose of the search is to deliver the closest options to the viewer as possible so if they find a match in the actual content of the video, it will be ranked better than a video that doesn't have the content matched. The transcribing function offered by Youtube is not perfect - it does a poor enough job at the moment that transcribing them yourself and uploading the file is worth the time.