1. I'm going to give each player their own character creation thread. In that thread you will make your ability rolls for up to three sets of characters simply by musing "Character Creation Roll #1" as the first roll, and "3d6, 3d6, 3d6, 3d6, 3d6, 3d6" under the dice to be rolled. Then repeat twice more (please don't roll up your characters here, it's going to get confusing, especially with seven possible players). You choose which of your three sets of rolls will be your character. The two unused sets will be kept on standby for backup. Should you character die (as is quite common in B/X D&D) and you wish to continue playing, you can make one new set of rolls and choose from either the new roll or one of your original two unused rolls for you backup character.
See post below for an example example. Again, please don't roll up your characters here, it's going to get confusing, especially with seven possible players.
2. Choosing classes is probably going to be the most glitchy hangup for this process. You have the core classes of B/X D&D (Cleric, Fighter, Magic-User, and Thief in the human category; and then Dwarf, Elf, and Halfling in the race-as-class category), and then you'll have the option of also choosing the "Advanced" classes, which reflect more closely to classes that were available to play in AD&D, but still keep true t the B?X rules of the game (acrobat, assassin, barbarian, bard, druid, illusionist, knight, paladin, and ranger for humans; drow, duergar, gnome, half-elf, half-orc, svirfneblin for race-as-class characters).
I think the easiest thing to do is for me to just make a separate thread where I post a photo of each class as it's layed out in the OSE Books and let you choose which one you wish to play based on the photos.
3. Does that make sense, or are there any questions?