To update a mod, you will have to go to the website that you've found your mod.
Redownload it and re-install it.
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No your have to wait for the mods to update which may take some time.
The mod developer will need to update the mod to be compatible with the new Minecraft version.
The black screen means the mods you have installed are either incompatible with the game or with each other To fix this you have to force Minecraft to update minecraft.jar, which will uninstall all your mods: before you log onto Minecraft click Options, click on Force update! and click close and log in as usual
'Herobrine' is a Minecraft urban myth, and does not exist outside of mods for the PC version.
Yes, most Minecraft Mods are updatable.