I think WCW could benefit from roster split in yearly 98, they had alot of main event caliber stars who couldn't coexist on the same show due to their massive egos and creative control options.
I would make Nitro use nWo, USA, Hardcore & TV titles and Thunder to use WHT, Cruise & Tag Team belts, so the two brands would be totally separated from each other and can tour different cities only to travel at the same time for PPVs.

Nitro roster will consist of: nWo (Hogan, Nash, Giant, Bugwell, Syxx, Savage), DDP, Luger, Goldberg, Raven Flocks (Raven, Kidman, Saturn, Morrus), Regal, Dave Taylor, Kanyon, Fit Finlay, Scott Norton, Wrath, Bam Bam Bigelow, Norman Smiley, Alex Wright, Konnan, Marty Jannetty, Mango

the first rivalries should be DDP vs Hogan, Nash vs Giant, Goldberg's streak
comissioner - Roddy Piper

Thunder roster: Harts Foundation (Bret hart, British Bulldog, Jim Neidhart), 4 Horsemen (Flair, Hennig, Anderson, Malenko, Benoit), Sting, Scott Hall, Chris Jericho, Eddie Guerrero, Chavo Guerrero, Ultimo Dragon, Chono & Nagata, Harlem Heat, Steiners, Psicosis & La Parka

comissioner - Ric Flair

first feuds - Sting vs Hall, 4 Horsemen vs Harts Foundation, Jericho vs Guerrero

i will not show Bret Hart on WCW tv or PPVs until the very first Thunder program, so i can draw in more viewers and will launch it in Montreal if possible. Thunder will probably be taped the day before so it can cost less.