First of all i'd start with the muscle which wierd enough would be dwayne the rock johnson as hercules from the movie "hercules" due to his enormous stength as shown when breaking his chains that were tied down to rock.He's also pretty smart when it comes to war so i thought he would be pretty handy when it came to a situation with fighting bandits or zombies.
second the flash. Grant gustins the flash to be precise the flash could scount ahead for enemies and to check if the coast were to be clear so to speak. He would also be able to help our team with gaining supplies at a "fast" rate. Hehe.
Third the brains. Batman. Its pretty self explanitory