1.4 thousand subs is nothing for Youtube. Get 50+ thousand, than you can start offering your promo services.
The number of subs is really not what matters, it's the number of views he gets an average for new videos.
Anyway, OP you should make a thread in the services section and at least give out some more detailed information about your Youtube channel.
I have no idea why you wouldn't want to share your Youtube channel publicly... You're a Youtuber, you benefit from promoting your Youtube channel.
Not wanting to share it publicly seems a bit shady to me.