You can either play Walker / Jim / Karlee.
Pretty straightforward build. Try to find a bareth / phoenix as soon as possible, weapon scavenger might be needed in this build but it delays your core cards.
Box O Bags is a fun addition, giving 1 extra offensive slot for the team. It basically gives 4 extra pipebomb / grenades / barbwire for the team.
The rest of the card just focus on mobility and damage.