What's the best total supply to choose for a token ?
How long the token should take to be issued completely ?
This is relative. But see that a high quantity is recommended for total supply.
I think that it is necessary to understand where is the value that the token contributes and what mechanisms will be created so that the token absorbs value...
Have not you planned to organize an ICO?
Oh, ICO is good. Let's discuss that in discord please. I'll pm you about that.