T-Shirt & Badge Design for Sales Teams

I'm looking to design really sleek t-shirts and brand apparel for each of my different sales teams. I'm providing the sales team names below. The teams are genuinely really young and super competitive. I need these tshirts to look very modern and sleek. They need to be on brand with the name.

Sales Mafia
Team Mojo
SJ Rockstars
Dominators
Solarnators
Silent Assassin
Team Ballers
Dream Team
Team Empire

I'll provide ideas, fonts, and concept after I accept the proposal.