Cool that you registered man! Sounds like a busy schedule yeah
Onto your questions:
1: As you can see here (and let's use it as an example), you get to name your own track. It will contain an OCRemix ID number if it gets uploaded to YouTube as part of the mixpost flood to promote the album, and as such will receive an OCRemix ID number. This will only happen if the project coordinators select your track as one to be posted in the mixpost flood. Per example, this Tetris mix has the following name in the album directory (which shows up when people download the complete albem per torrent or direct from the site):
15 Crimea River (Tetris - A-Type) [sir_NutS]
But the following name from the loose download page:
Tetris_Crimea_River_OC_ReMix
1.1: As per the example, your name will be present both in the filename as well as in the MP3 tag if downloaded as album, but not when you are part of the mixpost flood. It will be present in the "Contributing Artist" field, though. One way or another, when someone plays the track, they'll know it was you who made the track!
2: As far as my knowledge of OCR posting goes, this is no problem at all. I've seen enough people do it, with or without an OCR video attached to it
3: This album will not be sold; it's a free-to-download album. There are several albums available on OCR that are commercial releases, but this (as far as I know) won't be one of them.
We're planning on releasing the album on the 23rd of June, 2016. In the meantime there will be deadlines to see how everyone is progressing with their tracks. If someone is lagging behind too much, this could mean that someone else, if available, will remix the track instead.
So there's that! Hope I answered your questions to your liking