Debian :: Distribute Pub Key For .deb / Repo?

I have already created little .deb with a private key. And I am confused about the next step i.e. release

[1] If I simply provide the .deb as downloadable , then how can I provide the public key to the user, so that they can confirm the signature ?
Should I need to provide the fingerprint only ? What should they actually need to do ?

[2] If I create a repo with reprepro, then how can I sign the repo with my private key, and what should the users need to do to confirm the signature verification,
i.e. how can I provide the public key to the user ? and what should they need to do to access the repo for signature verification ?