Console workshop

So, I don’t really understand how the workshop works and I can’t find anything online pointing me to any answers I would really appreciate some more information on what its use is and how you’re supposed to get the coupons for the vehicles to swap out. Since on console we don’t have access to the marketplace I was just pretty confused how we are expected to get the more or less rare vehicles to switch out for other ones specifically in the battle trophy’s section where I don’t know of any in game way to currently get said vehicles. Any help would be amazing, thank you!