I have no particular reason for not playing other than I haven't been following this at all. So I have no idea what to do or how to do it, but I'd be happy to participate...?
It's pretty easy. I make lots of mistakes, so I usually just wing it and fix my mistakes as I catch them. What kind of character would you like to play? There is a roster of official characters, with four that appeared in the initial game and the others later being sold for lots of money because it's Games Workshop that made this stuff, but I have PDF stuff with the information for all of the official characters, which are...
Barbarian
Elf (Mooseman is one)
Dwarf (Spiderman is one)
Wizard
Chaos Warrior (Turgy22 is one)
Trollslayer (a sort of dwarf berserker that seeks an honorable death in battle against a powerful monster)
Pit Fighter (a gladiator basically, with customizable characteristic gains that are kind of overpowered)
Imperial Noble (would totally win a pistol duel, unlike Turgy's character)
Wardancer (a wood elf, like the regular elf character, but dual-wielding swords and twirling around like a maniac)
Elf Ranger (misnomer, because this character isn't actually better at using bows than the standard elf; a sort of warrior/mage hybrid that can choose to focus on either aspect)
Brettonian Knight (a knight with a big broadsword, which seems self-explanatory)
Warrior Priest (Melkor was one, but he dropped out at some point and I've had his character on autopilot)
Witch Hunter (hunts evil stuff and has special charms and junk)
There are also a lot of unofficial characters that people used to create, some of which are pretty nicely balanced. BigBlue wanted to be a skaven, so his character is a Skaven Gutter-Runner (an assassin). There are a lot of other options, so if you want to try something other than one of the official characters, I can check to see if anyone has built unofficial rules for the sort of character you want.