1-month old replay caster looking for streaming advice!

So after about a solid month, I'm at 17 matches casted on da youtubes, a Twitch account and two streams but no viewers, and a newfound passion for only commentating matches while streaming.

I guess this is a multi-part topic.

How many people here would be interested in live commentary on a stream, instead of live gameplay? Seems like a nice niche for me to get into that I don't think anyone else is doing (aside from tournaments).

Also, anyone got any advice on streaming/overlays/etc? How did these bigger people build such a huge damn fanbase full of kappas and such?

And what's a good way to post youtube vids? Currently I'm using the dota2castit subbreddit (and friends) to get matches to cast and posting ASAP, sometimes several times a day. I was debating going to a regular episode format. How many replays per week would be "enough?" Ti5 research slowed me down, but other than that, I'm holding at about 1 per day, decently. Thoughts?

Lastly, I'd love some advice on casting in general, and voice coaching/speech patterns/etc. I really want to go pro on this within a year.

Here's the channels:

https://www.youtube.com/channel/UCXxBLtDebkSG7ko7TCQ7dGw

https://www.youtube.com/user/Gavingoodrich45 (old channel)

http://www.twitch.tv/kairoscommentary/dashboard

Thanks in advance for the tips, guys! Looking forward to doing your matches, hopefully live someday!