Re: How to use to promote a channel of youtube
If I talk specific to Adwords, you can promote your youtube videos using Adwords for videos campaign. You can link your youtube account with your Adwords account and start promoting your youtube videos directly inside Adwords account.In addition you can get more insights like how many views, how many users clicked on your site after watching that video etc...
Find more details about it here: https://support.google.com/adwords/answer/2375425
If you directly want to advertise on youtube, here's the link to follow: https://www.youtube.com/yt/advertise/